Code submissions have continually suffered from formatting
inconsistencies that constantly have to be addressed.  Using
clang-format simplifies this by making code formatting more consistent,
and allows automation of the code formatting so that maintainers can
focus more on the code itself instead of code formatting.

libobs: Full-screen triangle format conversions

The cache coherency of rasterization for full-screen passes is better
using an oversized triangle that is clipped rather than two triangles.
Traversal order of rasterization is GPU-specific, but will almost
certainly be better using an undivided primitive.

A smaller benefit is that quads along the diagonal are not evaluated
multiple times, but that's minor in comparison.

Redo format shaders to bypass vertex buffer, and input layout. Add
global shader bool "obs_glsl_compile" to make API-specific decisions,
i.e. handle upside-down UVs. gl_ortho is not needed for format
conversion because the vertex shader does not use ViewProj anymore.

This can be applied to more situations, but start small first.

Testbed full screen passes, Intel HD Graphics 530:
RGBA -> UYVX: 467 -> 439 us, ~6% savings
UYVX -> uv: 295 -> 239 us, ~19% savings

libobs/UI: Implement an item_locked event

libobs: Area-resampling shader optimizations

libobs-d3d11: Clean up device_projection_pop

UI: Use stream track if no tracks are selected

This reverts commit 8a22889e.

After further usage, result is undesirable.  We don't need the theme
applied to projectors.

libobs: linux-v412: obs-ffmpeg: Add packed BGR3 video support

libobs: Remove unnecessary frame pipelining

Similar to item_visible, this event fires whenever a scene item is
locked or unlocked. This allows the UI and libobs to remain in sync
regarding scene elements' statuses.

libobs: Improve low-resolution bilinear sampling

libobs: Disable blending when converting sources

This fixes the issue where limited-range RGB sources were being
composited with dirty render targets.

Fixes a bug where if the user gave a custom color to a source list item,
the edit box used with renaming the item would also have that
background color while editing the name, awkwardly.

If the user gave the source list item a custom color, the "background"
stylesheet value would apply to children of the item widget, causing the
lock/eye checkboxes to also have that background color added on top of
the chosen color.  This is fixed by explicitly settings the background
value to none on the lock/eye checkboxes.

Apparently certain versions of Qt have a bug where the tray icon's
internal "visible" variable is set to false despite the fact that it
still shows.  Calling show() first before calling hide() sets the
internal boolean value and fixes the issue with the hide call.

Simplify STL usage as requested by function comment.

Switch for loop to do/while because we know the condition is always
true for the first loop.

Replace int math with float math to play nicely with more GPUs.

Add variables imagesize/targetsize to avoid redundant reciprocals.

Intel GPA results: 1166 -> 836 us

UI/updater: Various updates

UI: Fix output icon size. Add padding to settings list items

UI: Fix transition A/B labels on macOS/Linux

Previously, if the video size in OBS was too big, the labels would not
render on macOS/Linux due to the labels not fitting inside the texture
in the freetype plugin. This change makes it so that there is a maximum
size for the label, rather than being solely based on video size.

This change also makes the labels look centered on macOS/Linux, as
unlike the GDI plugin on Windows, the freetype plugin aligns the bottom
of the text with the bottom of the source.

Twitch will now return a 403 HTTP error code if you attempt to query
your stream key when your Twitch account does not have two-factor
authentication enabled.  This handles it a bit better and displays an
appropriate error message for users so they know where to go to enable
it.

Allows the ability to use things such as links in warning dialogs,
optionally.  Disabled by default.

This can take a while on a hard drive since it hashes the entire OBS
installation, show a undetermined progress marquee to avoid users
thinking that the updater has frozen.

Someone mentioned this format preserves the most quality for a
particular capture card using V4L2.