v1.0.6

Darby fixed Render->Alpha Blend modes which were partially broken.
Darby fixed macOS checkers drawing.
Darby added gradient background and moved it to draw video.
Made Background colors use Flmm's color chooser with alpha (alpha is current discarded, thou).
Added printing out of audio and video codec names when saving with FFmpeg.
Fixed presets names. Instead of using '_' we now use '-'.
Added last successful saved movie to recent files for easy checking it back.
Fixed pixel format selection in VP9 codec not working properly due to profile being set to 0, which would prevent saving with 10 or 12 bits.
Fixed Prores color shifting due to bad unneeded use of libswscale API.
Added options for color_range, colorspace, color_primaries and color_trc in tlRender's source code. mrv2 can set them if you open the window called Advanced Settings in the Save Movie dialog.
Made mrv2 remember the save movie and image settings for easy saving of multiple movie or image files.
Made FFmpeg errors be reported to the console immediately.
Fixed macOS VideoToolbox's hardware encoding not working.
Fixed Windows' presets not being read due to spaces in the installed directory.
Fixed a long standing bug of gamma (when changed in the top bar slider) not being reapplied when changing from one clip to another.

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