* Better handle LTO_ENABLE
Especially when calling from command line
* Replace LINK_TIME_OPTIMIZATION_ENABLE with LTO_ENABLE
* Remove long for LTO from show_options.mk
* Enforce definition of `DIODE_DIRECTION` for non-custom matrix boards
* Define diode direction for failing boards
* Matching parentheses
* Put onekey diode directions in top level config
* Remove the need to set NUM_OF_ENCODERS
Instead, calculate the size of the array, and use that instead
* Add hack for split common support
* Remove NUM_OF_ENCODERS from keyboard config
Can be reverted, if needed