Blender Git Loki

Patch #20693: add parameters for FPS and wait timer for screen cast

This patch by Guillaume Lecocq (lguillaume) adds user preference settings for setting the playback frame-rate and delay between captured frames for the screencasting feature.

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I've made a few tweaks for a few minor issues
- Made DNA vars for these settings shorts instead of ints, reducing the number of unnecessary extra pad vars
- Added version patching to ensure that these settings are initialised by default
- Made tooltips for the settings more descriptive