if you compare split_util.h with the original project by ahtn, the
address we look for isLeftHand config went from addr 7 to addr 10
(decimal). The EEP files were not updated.
EE_HANDS should not be enabled by default since it's more confusing for
most users
* 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
