added en-dash and gbp keys and updated readme

big restructure now I only have to consider macOS, also added mouse, more function keys, and some neat macros

removed windows layer and updated brightness keys for macOS Sierra

changed RALT to LALT on Windows

fixed comments

Update readme.md

Update readme.md

updated readme

added close key for alt-f4 macro

added a toggle between Mac and Windows base layers (with swapped cmd and ctrl)

Merge pull request #786 from mannkind/patch-1

Fix lets_split.c so that audio can be disabled

Fix lets_split.c so that audio can be disabled

Matching the use of `#ifdef AUDIO_ENABLE` used in `matrix_init_kb()` in order to compile firmware for the Let's Split keyboard without audio enabled.

Merge pull request #785 from jcowgar/master

Added Jeremy’s Atreus Layout

Merge pull request #784 from Dbroqua/master

Added dbroqua layout for HHKB keyboard

Merge pull request #781 from cbbrowne/master

Recent enhancements to keyboard map

Added Jeremy’s Atreus Layout

- Added dbroqua layout for HHKB keyboard

Merge pull request #5 from jackhumbert/master

Merge from jackhumbert

Merge branch 'master' of github.com:jackhumbert/qmk_firmware

Disables sleep LED by default