Functions are mostly related to changing the RGB lights depending on user interaction and when idling.
Common functions are declared in utils.h. These function are not directly RGB related but used to modify state and calculate values.
Functions in rgb_matrix_effects.h make use of common function in utils.h and are used to create to RGB matrix effects such as fading or breathing.
The functions declared in vitoni.h are used as entry points for usage of RGB effects.
One entry point is matrix_scan based for regular task while the other is process_record based for user activity tasks.