* Moved duplicated defines out of inappropriate source files (matrix
pins in keymap subdirectory)
* Eliminated default keymap directory
* Hardcoded serial keymap to use serial defines and EE_CONFIG
* Hardcoded i2c keymap to use i2c defines
new file: keyboards/lets_splitv2/Makefile
new file: keyboards/lets_splitv2/config.h
new file: keyboards/lets_splitv2/i2c.c
new file: keyboards/lets_splitv2/i2c.h
new file: keyboards/lets_splitv2/imgs/split-keyboard-i2c-schematic.png
new file: keyboards/lets_splitv2/imgs/split-keyboard-serial-schematic.png
new file: keyboards/lets_splitv2/keymaps/default/keymap.c
new file: keyboards/lets_splitv2/lets_split.c
new file: keyboards/lets_splitv2/lets_split.h
new file: keyboards/lets_splitv2/matrix.c
new file: keyboards/lets_splitv2/pro_micro.h
new file: keyboards/lets_splitv2/readme.md
new file: keyboards/lets_splitv2/serial.c
new file: keyboards/lets_splitv2/serial.h
new file: keyboards/lets_splitv2/split_util.c
new file: keyboards/lets_splitv2/split_util.h
new file: keyboards/maxipad/Makefile
new file: keyboards/maxipad/config.h
new file: keyboards/maxipad/keymaps/default/Makefile
new file: keyboards/maxipad/keymaps/default/config.h
new file: keyboards/maxipad/keymaps/default/keymap.c
new file: keyboards/maxipad/keymaps/default/readme.md
new file: keyboards/maxipad/maxipad.c
new file: keyboards/maxipad/maxipad.h
new file: keyboards/maxipad/readme.md
