Add API flag to start presets with clean canvas #952
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Adds projectm_set_preset_start_clean() and projectm_get_preset_start_clean() functions to control whether new presets start with a black canvas or inherit the previous preset's last frame. Default behavior remains unchanged (copy previous frame), but applications can now opt-in to clean starts by setting this flag to true. Fixes #298
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Adds option to skip the initial texture copy when transitioning to new presets.
When enabled via
projectm_set_preset_start_clean(true), the previousframe's texture is not drawn as the initial state for the new preset.
This provides a clean black canvas instead, which some applications may prefer.
Fixes #298