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Port pd-l2ork upstream commits from Dec 7, 2015 improving the handling of $ substitutions in GUI elements. Also fixes #195.

cleanup iemgui dialog form names, replacing dashes with underscores. Fix stray bugs in canvas dialog, and clean up css selector names

cherry-pick Albert Gräf's branch: Comment out a bunch of debugging statements which add a lot of noise to the console.

- ret.split(";") should be ret.split(problem_chars[i])
- remove the function from dialog_canvas.html where it isn't needed

we just hide the "apply" button

for garrays we disable editing gl_x1 and gl_x2. They get set automatically to show the entire array by default. May want to revisit array viewport later, but for now this keeps the bug from happening.

* canvas dialog is a bit too complex to have "Cancel" button revert any changes we may have applied. (It's not out of the realm of possibility, but for now it's easier just to use a nonstandard "Close" button to show the discrepancy)
* font dialog updates on change of radio button, so we just need a "Close" button there
* prefs dialog also too complex to do a revert on "Cancel"
* iemguis and gatom properly revert on "Cancel"

Fix nasty bug with array name not updating properly on its graph, plus a more trivial bug with the canvas properties not getting updated properly

(but patches which already have multiple arrays in a graph will continue to work)

fix feature for putting array in existing graph
add a delete checkbox for graphs with multiple arrays

refactor dialog_canvas.html to use javascript objects instead of ["name1", "value1", "name2", "value2", etc.] arrays