* clean up rgb matrix extern usage
Moved rgb matrix boiler plate into macros
Rebased onto typing heatmap pr
* Fixing the reversed frame buffer access in digital rain
* Fixing digital rain & typing heatmap if keyreactive effects are not enabled
* Apply suggestions from code review
Co-Authored-By: Drashna Jaelre <drashna@live.com>
* Adding parenthesizes to DRIVER_LED_TOTAL where necessary
* Updated docs
* added notes about parentheses
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