Add timer stubs for the 50D for `mlv_play`

Created originally on Bitbucket by ayshih (Albert Shih)

Was already merged in Bitbucket before import, marked as merged by the import user

Adds stubs for SetHPTimerAfterNow and SetHPTimerNextTick (and FIO_SeekSkipFile) for the 50D. These stubs were confirmed to be working by running mlv_play in "exact" playback mode (where the FPS is matched).

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