Creates a layouts/ folder for keymaps shared between keyboards (#1609)

* include variables and .h files as pp directives

* start layout compilation

* split ergodoxes up

* don't compile all layouts for everything

* might seg fault

* reset layouts variable

* actually reset layouts

* include rules.mk instead

* remove includes from rules.mk

* update variable setting

* load visualizer from path

* adds some more examples

* adds more layouts

* more boards added

* more boards added

* adds documentation for layouts

* use lowercase names for LAYOUT_

* add layout.json files for each layout

* add community folder, default keymaps for layouts

* touch-up default layouts

* touch-up layouts, some keyboard rules.mk

* update documentation for layouts

* fix up serial/i2c switches

layouts/community/60_iso/unxmaal/README.md

@@ -0,0 +1,22 @@
+Unxmaal's GH60 Layout
+=====================
+* Mostly stolen from /u/robotmaxtron
+
+##Quantum MK Firmware
+For the full Quantum feature list, see the parent readme.md.
+
+* Standard Mac ANSI layout
+* Spacebar acts as space when tapped, Fn when held
+* Menu acts as menu when tapped, Fn2 when held
+* Layer1:
+  * Top row = `~, F1-F12, Del
+  * JKIL = arrow cluster
+* Layer2:
+  * Top row = media controls
+  * JKIL = PgDn/Up/Home/Insert
+  * Backspace = Reset
+
+### Additional Credits
+Keymap has been based on various keymaps available from the QMK Repo for the GH60-SATAN and KC60 keyboards.
+
+![wiring](https://i.imgur.com/8b8T1fQ.jpg)