* 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
* Refactor splittest to support multiple dev boards
* Refactor splittest to support multiple dev boards - revert change to number of RGB led
* Refactor splittest to support multiple dev boards - update docs
* Refactor splittest to support multiple dev boards - correct docs
* Refactor splittest to support multiple dev boards - update teensy master logic