UI: Make links in updater dialog clickable

obs-filters: Fix LUT file extension filter on Linux

obs-qsv11: Fix target usage values

UI: Fix crash on settings update

Warning pass 2020-03-19

UI: Add setting for Mixer add-on choice (MixrElixr)

Not all devices return PKEY_AudioEngine_DeviceFormat properties.

Per MSDN, if the PROPERTYKEY referenced in key is not present in
the property store, this method returns S_OK and the vt member of
the structure pointed to by pv is set to VT_EMPTY.

PR #1937 (commit b9ad1ceb) added QSV target usage options, but there was
a comma missing between two of the array entries. This resulted in
"faster" and "veryfast" becoming "fasterveryfast", which is not valid.

Code style changes were required by .clang-format.

memcpy unlikely to exceed 4 GB, but just make VS happy.

VC++ wants noexcept for move assignment operators, and move contructors.

Allows unique_ptr to clean up without warnings.

This reverts commit 9931f22f.

Fixes a crash with size somehow becoming 0x0 for a source, and fixes a
crash when specific local file settings are used.

Makes sure preview is properly enabled/disabled when minimizing to tray,
when restoring from tray, or when starting the program up minimized to
tray

This change reduces the number of triangles drawn using a TRISTRIP while
still producing the same shapes for parts of the preview.

MixrElixr Emotes is the emote-specific portion of
MixrElixr, a popular extension for Mixer chat.

Disabled by default.

libobs-winrt: Catch more hresult exceptions

Wrap winrt_capture_supported and winrt_capture_cursor_toggle_supported
with try/catch.

This fixes a bug where games like "Don't Starve Together" wouldn't
capture because their actual render window is a completely different
window than their actual window on the screen.

So, because we already have the hook info by this point with the last
known window handle available, instead of using 0 here, we can just use
the window handle provided by the shared memory.  And we didn't even
have to change the hook!  That's nice.

UI: Restart when browser hardware acceleration changed

libobs-winrt: win-capture: Clean up error handling

Use proper check to fix false positive on 1809, and rework error spew to
remove output parameters from winrt_capture_init.

Closes obsproject/obs-studio#2505

The program can get stuck waiting for the browser within a event queue,
so instead mark that the program is closing, do it in a separate thread,
signal the window when it's finished, and then check whether it's in the
process of closing before actually showing the dialog.