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

keyboards/alps64/keymaps/default/keymap.c

@@ -2,7 +2,7 @@
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     /* 0: qwerty */
-    KEYMAP( \
+    KC_KEYMAP( \
         GRV, 1,   2,   3,   4,   5,   6,   7,   8,   9,   0,   MINS,EQL, NUHS, BSPC, \
         TAB, Q,   W,   E,   R,   T,   Y,   U,   I,   O,   P,   LBRC,RBRC,BSLS, \
         CAPS,A,   S,   D,   F,   G,   H,   J,   K,   L,   SCLN,QUOT,ENT,  \