* Define default HSV and speed for RGB matrix.
* Documentation for configuration values RGB_MATRIX_STARTUP_HUE, RGB_MATRIX_STARTUP_SAT and RGB_MATRIX_STARTUP_VAL.
* Document RGB_MATRIX_STARTUP_SPD.
* Preserve the ordering.
* Left-right gradient.
* Update the comment to match the new functionality.
* CPP does integer division so this round is not necessary.
* The x-range is actually 224, update comment and use bit-shifting again.
* Update docs with gradient left-right effect and associated "DISABLE" option.
Rob Haswell