extend WIN32 FreeString work-around to all platforms
updated license headers
removed forced 10ms delay on fetching channels
Revert "lock asynchronous trigger functions" - this caused deadlocks on adding / deleting timers

This reverts commit 1d8f64c16ff1937ecc58bb11271c016d76aa428c.
request signal information asynchronously
settings: fixed audio stream types
xvdr version 0.9.7
Merge remote-tracking branch 'upstream/master'