UI: Theme case fix

All strings were treated as partial matches before, which caused a
false positive with any executable beginning with "time", notably
affecting the game "Timelie" which used Timelie.exe.

This isn't editable by the user, so it doesn't make sense to show it.

The files on disk are lower-case but QSS refrences them in
upper-case. Windows doesn't report errors as the platform isn't case
sensitive. Error messages are generated and icons not to render on
case sensitive platforms such as Linux and Mac

CI: Require VLC in CI builds, Fix VLC in CI

cmake: Fix warnings and normalize variables/errors

Previously VLC was downloaded but was skipped since it could not be
found. This sets the VLCPath to ensure it is found.

As of 3.17 using find_package_handle_standard_args checks that the name
of the FindXXX file and the first argument are the same case.

Some modules used non-standard variables or the old singular variables
instead of plurals. This normalizes variable usage to the new-style.

Some CMakeLists.txt did custom error checking instead of propagating
find_package errors. These were changes to call find_package with
REQUIRED or without QUIET where needed and shortens the custom status
messages. This helps users who want to enable that functionality see
what precisely wasnt found.

libobs: Implement and use better scaling function for 64-bit integers

Windows: Taskbar icon & colour

media-playback: Unbuffered Media Source

libobs: Fix potential truncation warnings

Set up dispatcher queue for WGC stability

win-capture: Fail on unsupported Vulkan formats

Fix WGC minimize handling

Suspected necessary for WGC stability.

Suspected necessary for WGC stability.

This reverts commit d777000a, reversing
changes made to c9e5f30a.

cmake: Fix warnings and normalize variables/errors

UI: Install public headers for frontend-api

Previously the api header was not targeted for installation and may have
been missing for third party users.

Expose more levels and profiles for FFmpeg VAAPI

Vulkan hook COM clean up, and extension check

win-capture: Use VkAllocationCallbacks

UI: Use standard resolutions with auto-config

Implement CUBE LUT domain properly, tetrahedral interpolation for 3D LUTs

UI: Don't clip meters when resizing with no input

Show accurate path in Crash dialog

Closes obsproject/obs-studio#2290

obs-ffmpeg: Fix srt output

Redirect non rtmp streaming to ffmpeg-mux instead of previous
ffmpeg-encoded-output which has been removed.

This replaces the ffmpeg-encoded-output which had serious issues
(missing headers, muxing issues with non compliant mpegts streams) with
an output grafted from obs-ffmpeg-mux.

Moves the code that generates a file read error message to its own
function for the sake of cleaning things up a bit.

UI: Hide script tabs if no python settings

UI: Remove language region