In commit d17ee208, we attempted to fix a race condition crash in the
Logitech plugin by deferring the "stream/recording/replay buffer active"
calls to the UI thread.  However, the Logitech plugin loop_function
funciton can call obs_frontend_streaming_active/etc functions while the
UI thread waits for the loop_function thread for many OBS events,
causing a hard lock in the Logitech plugin.  This fixes that by making
the obs_frontend_streaming_active/etc functions completely atomic
instead.  It's a bit of a hack but it's better than accessing objects.

Checks to make sure that DXGI_FORMAT_NV12 is actually supported by the
GPU.

Just gives a bit more breathing room before images start having to load.

UI: Fix replay buffer checked state when no hotkey is set

In the Twitch chat dock window, the "Moderation Tools" link in the chat
settings should not navigate the window to the new URL; it should pop up
the URL in the user's system browser instead.

UI: Fix wrong filename building for Remux dialog

Prevents a crash when using the new lookahead feature, presumably
because those textures are in use when the EOS is sent.

If the auth process failed on startup, the user is still able to use
their stream, just without the extra UI.  The auth object is still
technically existing, and the user can still stream, so don't treat it
like it's not connected in settings.

If the user disconnects OBS from their Twitch account on their Twitch
settings panel, then try asking the user if they'd like to reconnect
before throwing an error.

If the user disconnects OBS from their Mixer account on their Mixer
settings panel, then try asking the user if they'd like to reconnect
before throwing an error.

This is a little bit embarrassing.  We'll just pretend we didn't see
that.

The message boxes that tell you that the browser is initializing or that
you're authenticating with twitch are annoying on startup.  It makes
sense to do it in the settings/autoconfig dialogs where you sort of need
to know what's going on while waiting for it to connect, but on startup
it's not really necessary and can be kind of annoying.

The Auto-Configuration dialog was being created outside of the Qt
message loop, which could cause a lockup with auth code.

Fixes filters while preserving premult alpha

When starting the program with the --startreplaybuffer command line
parameter, it would not correctly highlight the button.

This should always be disabled if video output is active.  Additionally,
the expression used to determine whether it should be enabled/disabled
was very unreadable.

The stream key is saved, so don't overwrite stream key with auth key if
the auth key is invalid.

Using QFileInfo is better than mangling the string together ourselves
manually.

The previous commit in this module meant to defer the properties update
of the slideshow source, not the image source.  Wrong file was modified.

Additionally, check for null output handlers.