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/romanzolotarev-norman-qwerty-osx/readme.md

@@ -0,0 +1,34 @@
+# Roman's Layout
+
+There are two layers:
+
+- **BASE** is [Norman layout](https://normanlayout.info/).
+- **QWRT** is QWERTY.
+
+[![keyboard-layout](https://i.imgur.com/jfKBznw.png)](http://www.keyboard-layout-editor.com/#/gists/3b236f450da474dc506a5a80390c3cc7)
+
+## Switching
+
+- Tap `QWRT` to toggle **QWRT**.
+
+## LEDs
+
+- Red: QWRT is on.
+
+## Functional Keys
+
+- Tap `F1` to mute microphone via [Shush](http://mizage.com/shush/).
+- Tap `F2` to copy screenshot to the clipboard.
+- Hold `SHIFT` and tap `F2` to save screenshot as a file.
+- Tap `F3`, `F4`, `F5`, `F6` to resize a window via [Divvy](http://mizage.com/divvy/).
+
+## CTRL/ESC
+
+Both CTRL and ESC are frequently used in Vim.
+
+- Tap `CTRL/ESC` to send `ESC`.
+- Hold `CTRL/ESC` to use as `CTRL`.
+
+## Activate N-rollover
+
+- Hold left `SHIFT` and right `SHIRT` and then tap `N`.