move game drawing to IMGUI::end() - #99
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…so that frame dropping can be effective again
In order for the current frame drop mechanism to work, we need to make sure that all the heavy SDL calls happen inside the guarded part, which is mostly
IMGUI::end(). I've thus changed it so that IMGUI also gets responsible for triggering the game drawing, by caching the game state until the actual draw call is made.