The code was checking stream_key, but stream_key could be the
user-supplied value (in_stream_key) or the server-supplied value
(endpoint.authentication). The server-supplied value may lack the query
parameters set in the user-supplied value. To ensure that user-specified
query parameters (such as bandwidthtest) are passed along, parse the
user-supplied key instead of the server-supplied key.
Modifies the encoder group API added previously to better follow the
existing libobs API naming paradigms. This also produces much more
readable code, and allows a few small benefits like only needing to
hold a reference to the encoder group, instead of every encoder.
When streaming with Multitrack Video (Enhanced Broadcasting) and
incompatible settings, the warning message was missing parts of the
string due to incorrect translation string keys.
Additionally, use Unicode arrows to direct users through UI elements.
