For additional safety, uncheck the bandwidth test checkbox so that the
setting isn't persisted in an enabled state when disconnecting or
switching a service. Also just straight up disable if not authed to
Twitch when saving settings.

Facebook provides CDN endpoints for users to optimize their bandwidth or
latency using the speed test on facebook.com/live/ingests/. In this case
streamers use a custom server endpoint that looks like
"rtmps://edgetee-upload-fml.xx.fbcdn.net:443/rtmp/".

This diff adds detection to users using the custom field for CDN
endpoints so we can show the stream key link button.

Old URL is being phased out for the cleaner interface. Changed in both
the settings pane and the wizard.

Closes obsproject/obs-studio#3005

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

Disabled by default.

Follow up to #2145: https://github.com/obsproject/obs-studio/pull/2145
The wizard has a stream link URL as well, adding the button in the
wizard to match. Additionally, fixing a few  errors in the UI layout
and spacing where items were not padded.

Fixes an issue where when trying to connect a Twitch account, and the
Twitch two-factor authentication check fails, the user will still
technically be logged in because the cookies will still be present, thus
when they try to click the "Connect" button again, it will skip the
login part (because they're already technically logged in), and just
give them the two-factor failure message without letting them enter in
their login information again.

Both BTTV and FFZ are fairly popular however they do occasionally
interfere.  To give users the option to chose whichever one they like
most we add a new setting that allows BTTV, FFZ, both, or neither.

Defaults to "None" for new users.  Existing users will be migrated to
"Both" as that's the previous behavior.

Most of the top streaming services now have a link in the stream key
label. Upgrading this button to a button clarifies the assistance
for the important step of setting up a stream.

Creates a new type of button for URL opening simply which also
automatically updates the tootip to the current URL.

Includes addition of Twitter/Periscope URL to make this feature more
complete.

Allows the users to find their stream key via a specified link if they
opt to just use a stream key instead of integration.

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.

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.

This was a feature that was available when you chose custom RTMP server;
it was not considered when making the new version.  Note: it looks
unslightly, but it works for now.

Adds the ability to connect/login to an account via the settings and
auto-configuration dialogs.  Checks registered Auth objects, and if the
Auth object matches the currently selected service in the settings
window or auto-configuration dialog, will display "connect account"
buttons for the user to be able to click (which are optional, they can
still use stream keys if they'd prefer).

Makes it so that services can have custom handling on a per-service
basis.  The bottom part of the service pane is now a stacked widget
which can now be customized for different types of services
(particularly OAuth services).