Talljoe's layout with common keymap. (#2764)

* Add userspace to talljoe layout.

* Move more authority to userspace and create Bananasplit layout.

* Move more things into userspace.

* Common Core example

* More work on common layout.

* Num layer.

* talljoe-ansi layout

* Updates for Zeal60

* Add Zeal60 to 60_ansi_split_bs_rshift

* Swap Escape and Grave

* Num-layer tweaks

* More tweaks.

* Add 1up60rgb to world of layouts.

* Rename ansi_split_bs_rshift layout to hhkb.

* Control RGB Backlight.

* change capslock led

* Remove obsolete line from rules.mk.

* Add user-friendly userspace override.

* Fix enter for 1uprgb60

* Revert "Rename ansi_split_bs_rshift layout to hhkb."

This reverts commit 53133719db25c7cb6a199108bbf5d980481a45f4.

build_keyboard.mk

@@ -204,7 +204,11 @@ else
 endif
 
 # User space stuff
-USER_PATH := users/$(KEYMAP)
+ifeq ("$(USER_NAME)","")
+    USER_NAME := $(KEYMAP)
+endif
+USER_PATH := users/$(USER_NAME)
+
 -include $(USER_PATH)/rules.mk
 ifneq ("$(wildcard users/$(KEYMAP)/config.h)","")
     CONFIG_H += users/$(KEYMAP)/config.h