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/french_hacker/readme.md

@@ -0,0 +1,30 @@
+# French hacker layout
+
+## Introduction
+
+[Colemak Mod-DH](https://colemakmods.github.io/mod-dh/) layout for
+users keeping an `azerty` layout configuration on their OS.
+
+This keymap is for users keeping their operating systems configured with
+`azerty` - for typing passwords or in their native languages - but who
+wants a Colemak Mod-DH layout on their mechanical.
+
+The symbols layers was done after analysing various programming
+languages sources codes and should be close to optimal for typing
+confort.
+
+Special macros for [Qubes OS](https://www.qubes-os.org/) are included.
+
+There is an accented characters layer for infrequent typing of french
+accents.
+
+Special macros for [Qubes OS](https://www.qubes-os.org/) are included.
+
+## Build
+
+    cd keyboards/ergodox
+    make french_hacker
+
+## Design explanations
+
+See my [blog post](http://dialectical-computing.de/blog/blog/2017/01/29/a-better-coder-layout-for-the-ergodox-ez-keyboard/).