Alex Duchesne b8c46a785e rg_system: Added app->frameTime to get expected frame time
retro-go now always maintains the expected time a frame should take (time between ticks).

I've added `rg_system_set_tick_rate` to replace `app->tickrate = N` to ensure frameTime is recalculated when tickrate changes.
2024-11-30 13:45:01 -05:00
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