v1.2.0

Fixed Wayland support again on Linux which had broken in v1.1.9 due to
Darby's update of glfw3.
Fixed Wayland resizing due to a bad FLTK commit.
Fixed libvpx compilation on Windows which had broken due to an upgrade in
MSys2's yasm assembler.
Made compiling FFmpeg on Windows be done in tlRender with MSys2, instead
of the pre-flight script, so that we can use --enable-zlib and share all
flags.
Fixed Repeat Frame not respecting the pixel depth of the previous frame
when Preferences->Loading->Missing Frames was set to Repeat or Scratched.
Fixed Missing Frame when Autoplay was Off.
Fixed Caching starting from behind when Autoplay was Off.
Fixed Docking and Docking attempts to happen once the corner of the Window
enters the docking area.
Added support for VP8 decoding so that Ubuntu's screen capture videos can
be played.
Added support for macOS Sequoia (beta).

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