ci: Deduplicate scripts and break into sections

The GitLab CI commands are now separated from the job definitions, using
YAML anchors.

The build and test commands should now show as separate, collapsible
sections in the job output (as documented at
https://docs.gitlab.com/ee/ci/pipelines/#custom-collapsible-sections).

.gitlab-ci.yml

+# This file creates automated tests on GitLab CI for Purr Data.
+# See https://docs.gitlab.com/ee/ci/yaml/README.html for details of the format.
+
+# These are script snippets used in the jobs defined below.
 .debian_image_preparation: &debian_image_preparation
   - echo "" | sudo -S apt-get -qq purge -y pd-l2ork > /dev/null || echo "couldn't purge..."
   - echo "" | sudo -S DEBIAN_FRONTEND=noninteractive apt-get -qq -y update > /dev/null
   - echo "" | sudo -S DEBIAN_FRONTEND=noninteractive apt-get -qq -y upgrade > /dev/null
 
+.build_all: &build_all
+  - echo -e "section_start:`date +%s`:build_all\r\e[0KBuilding Purr Data"
+  - cd l2ork_addons
+  - ./tar_em_up.sh $BUILD_TYPE_FLAG
+  - cd ..
+  - echo -e "section_end:`date +%s`:build_all\r\e[0K"
+
+.test_linux: &test_linux
+  - echo -e "section_start:`date +%s`:test_linux\r\e[0KTesting Purr Data for Linux"
+  - echo "" | sudo -S DEBIAN_FRONTEND=noninteractive dpkg --force-all -i pd-l2ork*.deb > /dev/null
+  - valgrind pd-l2ork -noprefs -nogui -nrt -noaudio -send "init dollarzero \$0" scripts/regression_tests.pd
+  - valgrind pd-l2ork -noprefs -nostdpath -nogui -nrt -noaudio scripts/external-tests.pd
+  - echo -e "section_end:`date +%s`:text_linux\r\e[0K"
+
+.test_osx: &test_osx
+  - echo -e "section_start:`date +%s`:test_osx\r\e[0KTesting Purr Data for Mac OSX"
+  - cd scripts
+  - ../packages/darwin_app/build/*.app/Contents/Resources/app.nw/bin/pd-l2ork -noprefs -nogui -noaudio -send "init dollarzero \$0" regression_tests.pd
+  - ../packages/darwin_app/build/*.app/Contents/Resources/app.nw/bin/pd-l2ork -noprefs -nostdpath -nogui -noaudio external-tests.pd
+  - echo -e "section_end:`date +%s`:text_osx\r\e[0K"
+
+.test_windows: &test_windows
+  - echo -e "section_start:`date +%s`:test_windows\r\e[0KTesting Purr Data for Windows"
+  - cd scripts
+  - ../packages/win32_inno/build/bin/pd.com -noprefs -nogui -noaudio -send "init dollarzero \$0" regression_tests.pd
+  - ../packages/win32_inno/build/bin/pd.com -noprefs -nostdpath -nogui -noaudio external-tests.pd
+  - echo -e "section_end:`date +%s`:text_windows\r\e[0K"
+
+
 debian_stretch_x86_64_deb:
    tags:
      - debian
      - stretch
      - x86_64
+   variables:
+     BUILD_TYPE_FLAG: -B
    before_script:
      - *debian_image_preparation
    script:
-     - cd l2ork_addons
-     - ./tar_em_up.sh -B
-     - cd ..
-     - echo "" | sudo -S DEBIAN_FRONTEND=noninteractive dpkg --force-all -i pd-l2ork*.deb > /dev/null
-     - valgrind pd-l2ork -noprefs -nogui -nrt -noaudio -send "init dollarzero \$0" scripts/regression_tests.pd
-     - valgrind pd-l2ork -noprefs -nostdpath -nogui -nrt -noaudio scripts/external-tests.pd
+     - *build_all
+     - *test_linux
    artifacts:
      name: "$CI_RUNNER_DESCRIPTION"
      expire_in: 1 day
@@ -28,16 +59,13 @@ ubuntu_16.04_x86_64_deb:
      - ubuntu
      - v16.04
      - x86_64
+   variables:
+     BUILD_TYPE_FLAG: -B
    before_script:
      - *debian_image_preparation
    script:
-     - cd l2ork_addons
-     - ./tar_em_up.sh -B
-     - cd ..
-     - echo "" | sudo -S DEBIAN_FRONTEND=noninteractive dpkg --force-all -i pd-l2ork*.deb > /dev/null
-     - cd scripts
-     - valgrind pd-l2ork -noprefs -nogui -nrt -noaudio -send "init dollarzero \$0" regression_tests.pd
-     - valgrind pd-l2ork -noprefs -nostdpath -nogui -nrt -noaudio external-tests.pd
+     - *build_all
+     - *test_linux
    artifacts:
      name: "$CI_RUNNER_DESCRIPTION"
      expire_in: 1 day
@@ -49,13 +77,12 @@ osx_10.11_x86_64_dmg:
      - osx
      - v10.11
      - dmg
+   variables:
+     BUILD_TYPE_FLAG: -X
    script:
      - echo `pwd`
-     - cd l2ork_addons
-     - ./tar_em_up.sh -X
-     - cd ../scripts
-     - ../packages/darwin_app/build/*.app/Contents/Resources/app.nw/bin/pd-l2ork -noprefs -nogui -noaudio -send "init dollarzero \$0" regression_tests.pd
-     - ../packages/darwin_app/build/*.app/Contents/Resources/app.nw/bin/pd-l2ork -noprefs -nostdpath -nogui -noaudio external-tests.pd
+     - *build_all
+     - *test_osx
    artifacts:
      name: "$CI_RUNNER_DESCRIPTION"
      expire_in: 1 day
@@ -67,13 +94,12 @@ osx_10.8_x86_64_dmg:
      - osx
      - v10.8
      - dmg
+   variables:
+     BUILD_TYPE_FLAG: -X
    script:
      - echo `pwd`
-     - cd l2ork_addons
-     - osx_version=10.8 ./tar_em_up.sh -X
-     - cd ../scripts
-     - ../packages/darwin_app/build/*.app/Contents/Resources/app.nw/bin/pd-l2ork -noprefs -nogui -noaudio -send "init dollarzero \$0" regression_tests.pd
-     - ../packages/darwin_app/build/*.app/Contents/Resources/app.nw/bin/pd-l2ork -noprefs -nostdpath -nogui -noaudio external-tests.pd
+     - *build_all
+     - *test_osx
    artifacts:
      name: "$CI_RUNNER_DESCRIPTION"
      expire_in: 1 day
@@ -84,13 +110,12 @@ windows_i386_innosetup:
   tags:
     - windows
     - i386
+  variables:
+    BUILD_TYPE_FLAG: -Z
   script:
     - echo `pwd`
-    - cd l2ork_addons
-    - ./tar_em_up.sh -Z
-    - cd ../scripts
-    - ../packages/win32_inno/build/bin/pd.com -noprefs -nogui -noaudio -send "init dollarzero \$0" regression_tests.pd
-    - ../packages/win32_inno/build/bin/pd.com -noprefs -nostdpath -nogui -noaudio external-tests.pd
+    - *build_all
+    - *test_windows
   artifacts:
     name: "$CI_RUNNER_DESCRIPTION"
     expire_in: 1 day
@@ -102,16 +127,14 @@ raspbian_stretch_armv7l_deb:
      - raspbian
      - arm 
      - stretch
+   variables:
+     BUILD_TYPE_FLAG: -r
    before_script:
      - *debian_image_preparation
    script:
      - echo `pwd`
-     - cd l2ork_addons
-     - ./tar_em_up.sh -r
-     - cd ..
-     - echo "" | sudo -S DEBIAN_FRONTEND=noninteractive dpkg --force-all -i pd-l2ork*.deb > /dev/null
-     - valgrind pd-l2ork -noprefs -nogui -nrt -noaudio -send "init dollarzero \$0" scripts/regression_tests.pd
-     - valgrind pd-l2ork -noprefs -nostdpath -nogui -nrt -noaudio scripts/external-tests.pd
+     - *build_all
+     - *test_linux
    artifacts:
      name: "$CI_RUNNER_DESCRIPTION"
      expire_in: 1 day