Revert "remove duplicated abstraction from non-default library"

This reverts commit d47295f5.

externals/hid/buttongate-help.pd

+#N canvas 0 31 463 514 10;
+#X obj 5 2 cnv 15 450 20 empty empty buttongate 2 11 1 18 -233017 -66577
+0;
+#X obj 160 287 bng 25 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
+-1;
+#X obj 160 151 loadbang;
+#X msg 160 171 1;
+#X obj 160 199 metro 150;
+#X text 27 470 (C) Copyright 2004 Hans-Christoph Steiner <hans@eds.org>
+;
+#X text 244 484 released under the GNU GPL;
+#X obj 223 417 pddp/pddplink ../all_about_hid.pd -text all_about_hid
+;
+#X text 114 418 For more info:;
+#X text 17 38 [buttongate] is a simple gate controlled by a HID button.
+You must specify the device and the button which controls the gate.
+The left inlet takes the data to be gated. The right inlet is for sending
+optional control messages to the HID.;
+#X obj 160 244 buttongate 0 btn_0;
+#X text 18 119 The first button on the first device controls this gate:
+;
+#X text 15 237 data to be gated -->;
+#X text 292 237 <-- msgs to [hid];
+#X obj 281 288 bng 25 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
+-1;
+#X msg 310 197 refresh;
+#X msg 299 176 open 2;
+#X text 39 294 button pressed->;
+#X text 310 293 <-- button released;
+#X text 23 348 Keyboard keys can also be used to control this object.
+You can get the [hid] keycode from here:;
+#X obj 324 368 ev_key-list;
+#X obj 422 3 pddp/pddplink http://puredata.info/dev/pddp -text pddp
+;
+#N canvas 504 253 494 344 META 0;
+#X text 12 165 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
+Wilkes for Pd version 0.42.;
+#X text 12 25 LICENSE GPL;
+#X text 12 145 AUTHOR Hans-Christoph Steiner;
+#X text 12 45 DESCRIPTION simple gate controlled by a HID button;
+#X text 12 65 INLET_0 bang;
+#X text 12 85 INLET_1 open refresh;
+#X text 12 105 OUTLET_0 bang;
+#X text 12 125 OUTLET_1 bang;
+#X text 12 5 KEYWORDS control user_input abstraction;
+#X restore 406 463 pd META;
+#X connect 2 0 3 0;
+#X connect 3 0 4 0;
+#X connect 4 0 10 0;
+#X connect 10 0 1 0;
+#X connect 10 1 14 0;
+#X connect 15 0 10 1;
+#X connect 16 0 10 1;

externals/hid/buttongate.pd

+#N canvas 367 43 525 408 10;
+#X obj 303 81 hid \$1;
+#X obj 303 24 inlet;
+#X obj 303 106 route key;
+#X obj 303 127 route \$2;
+#X obj 104 26 inlet;
+#X obj 104 295 outlet;
+#X obj 104 264 spigot;
+#X text 10 324 (C) Copyright 2004 Hans-Christoph Steiner <hans@eds.org>
+;
+#X text 226 340 released under the GNU GPL;
+#X text 16 371 $Author: eighthave $;
+#X text 16 388 $Date: 2004-11-25 02:42:49 $;
+#X text 16 354 $Revision: 1.2 $;
+#X obj 192 16 loadbang;
+#X obj 303 147 unpack f f;
+#X text 5 6 [buttongate];
+#X obj 242 263 spigot;
+#X obj 242 295 outlet;
+#X obj 333 195 - 1;
+#X obj 333 215 abs;
+#X msg 192 50 0;
+#X msg 243 50 1;
+#X obj 303 168 t f f;
+#X connect 0 0 2 0;
+#X connect 1 0 0 0;
+#X connect 2 0 3 0;
+#X connect 3 0 13 0;
+#X connect 4 0 6 0;
+#X connect 4 0 15 0;
+#X connect 6 0 5 0;
+#X connect 12 0 19 0;
+#X connect 12 0 20 0;
+#X connect 13 0 21 0;
+#X connect 15 0 16 0;
+#X connect 17 0 18 0;
+#X connect 18 0 15 1;
+#X connect 19 0 6 1;
+#X connect 20 0 15 1;
+#X connect 20 0 0 0;
+#X connect 21 0 6 1;
+#X connect 21 1 17 0;