fix: lobby music volume will be changed on options change without restart (also lobby...

fix: lobby music volume will be changed on options change without restart (also lobby music not looped anymore) (#25530)

* fix: lobby music volume will be changed on options change without restart (also lobby music not looped anymore)

* refactor: now lobby music is part of ContentAudioSystem. Lobby playlist is used instead of single track. Client now selects next lobby soundtrack after previous finished.

* refactor: incapsulated info on current lobby track in simple record

* refactor: fixed inconsistent naming between song and soundtrack for lobbymusic

* refactor: xml-doc for LobbyPlaylistChangedEvent

* fix: inverted invalid _audio.PlayGlobal check to return only if lobby soundtrack play call failed

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Co-authored-by: pa.pecherskij <pa.pecherskij@interfax.ru>