Make arguments redo, subproject elimination (#1784)

* redo make args to use colons, better folder structuring system [skip ci]

* don't put spaces after statements - hard lessons in makefile development

* fix-up some other rules.mk

* give travis a chance

* reset KEYMAPS variable

* start converting keyboards to new system

* try making all with travis

* redo make args to use colons, better folder structuring system [skip ci]

* don't put spaces after statements - hard lessons in makefile development

* fix-up some other rules.mk

* give travis a chance

* reset KEYMAPS variable

* start converting keyboards to new system

* try making all with travis

* start to update readmes and keyboards

* look in keyboard directories for board.mk

* update visualizer rules

* fix up some other keyboards/keymaps

* fix arm board ld includes

* fix board rules

* fix up remaining keyboards

* reset layout variable

* reset keyboard_layouts

* fix remainging keymaps/boards

* update readmes, docs

* add note to makefile error

* update readmes

* remove planck keymap warnings

* update references and docs

* test out tarvis build stages

* don't use stages for now

* don't use stages for now

keyboards/atreus/keymaps/dvorak_42_key/README.md

@@ -7,7 +7,7 @@ How to build and flash
 ----------------------
 
 to build;
-make atreus-dvorak_42_key
+make atreus:dvorak_42_key
 
 to flash:
 avrdude -p atmega32u4 -c avr109 -U flash:w:atreus_dvorak_42_key.hex  -P COM7

keyboards/atreus/keymaps/dvorak_42_key/keymap.c

@@ -15,7 +15,7 @@
 static bool mouse_lock = false;
 
 // building instructions:
-// make atreus-dvorak_42_key
+// make atreus:dvorak_42_key
 
 // flashing instructions:
 // avrdude -p atmega32u4 -c avr109 -U flash:w:atreus_dvorak_42_key.hex  -P COM7