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/videck/rules.mk

@@ -0,0 +1,17 @@
+AUDIO_ENABLE:=no
+BACKLIGHT_ENABLE:=no
+BLUETOOTH_ENABLE:=no
+BOOTMAGIC_ENABLE:=no
+COMMAND_ENABLE:=no
+CONSOLE_ENABLE:=no
+EXTRAKEY_ENABLE:=yes
+MIDI_ENABLE:=no
+MOUSEKEY_ENABLE:=yes
+NKRO_ENABLE:=no
+RGBLIGHT_ENABLE:=no
+SLEEP_LED_ENABLE:=no
+TAP_DANCE_ENABLE:=yes
+UNICODEMAP_ENABLE:=no
+UNICODE_ENABLE:=no
+
+