Closes obsproject/obs-studio#4263

Closes obsproject/obs-studio#4086

Add PolyStreamer.com to services.json, and increment the version in
accompanying package.json

Add EventLive endpoint and recommended settings to list of RTMP
services. Bump rtmp-services/data/package.json version

Closes obsproject/obs-studio#3932

Steam now automatically selects the closest available server

(This commit also modifies rtmp-services and UI)

Changes the maximum resolution size to a resolution list, and splits the
maximum FPS to its own function.

(Note: ABI has not been modified because the last changes still haven't
been released yet, so it's safe to modify this as long as the changes
haven't been officially released)

(This commit also modifies rtmp-services)

Implements obs_service_get_max_bitrate, which allows retrieving the
maximum audio/video bitrates directly rather than being forced to use
the apply method. Makes it a bit easier to get the bitrate values.

Add YouTube RTMPS service to services.json as a beta.

Viloud is an online video platform for creating and streaming live,
linear and on-demand TV channels.

(Jim) Allows the ability to get a link from the service's settings about
a specific service selection the user chooses and display it as a "More
Info" button that the user can click to find out more information about
that particular service.

It seems like weabook.live is no longer a live streaming provider.

This change adds both Mux's RTMP and RTMPS endpoints to
the list of prefilled services.

This isn't particularly needed, as a service with multiple tracks won't
be using multiple tracks to begin with anyway.  This might change later,
but for now just mark it deprecated.

If the video encoder allows video headers repetition at IDR frames,
and if the output is not rtmp (so srt, udp, etc with mpegts container),
this commit enables application of this setting from the custom service
(since srt is available through that service).