#2234 Stream As Talkgroup Aliasing Feature

[DSheirer]

Closes #2234

Implements a new 'Stream As Talkgroup' feature that allows the user to assign a Pseudo-Talkgroup value to an alias to use as the TO identifier in any audio streaming.

This can be used when the user wants to stream multiple P25 conventional/repeater channels where each channel is configured for Talkgroup 1, causing TO identifier collisions in the stream.

To use:

1. Create a separately named alias list for each conventional channel.
2. In each alias list, setup an alias and add a talkgroup identifier that matches the talkgroup used on that conventional/repeater channel.
3. In the alias editor for this alias, in the 'Streaming' panel, add a 'Stream As Talkgroup' value to use for this talkgroup.

Any calls to the original talkgroup will be aliased using the 'Stream As Talkgroup' when they are streamed.