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

1 files changed, 5 insertions, 1 deletions

diff --git a/keyboards/lets_split/lets_split.h b/keyboards/lets_split/lets_split.h
index 476e7fd2a..d9cfa35a2 100644
--- a/keyboards/lets_split/lets_split.h
+++ b/keyboards/lets_split/lets_split.h
@@ -3,7 +3,11 @@
 
 #include "quantum.h"
 
-#include QMK_SUBPROJECT_H
+#ifdef KEYBOARD_lets_split_rev1
+    #include "rev1.h"
+#else
+    #include "rev2.h"
+#endif
 
 // Used to create a keymap using only KC_ prefixed keys
 #define KC_KEYMAP( \