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/ergodox/emacs_osx_dk/readme.md

@@ -0,0 +1,10 @@
+# ErgoDox EZ Emacs-OSX-DeadKeys Configuration
+
+Since I'm an Emacs user, ctrl keys are very important and gets a placement where the usual caps_lock is. There
+are an extra pair of ctrls, just in case there where problems with the holding one's, but not as comfortable.
+
+Gui button takes a predominant place on the thumb cluster, as I'm using a mac os x and it relies heavily on it.
+
+Finally there is also two Right Alts to easily access to accented letters of the spanish alphabet.
+
+![Default](https://i.imgur.com/EDgp9xj.png)