Enable flac playback for WiMP

Parse data to figure out whether we're dealing with flac or mp3. Show
results and initialize streaming accordingly.
Some more debugging to inspect stream headers
Fix buffer calculation
Revert accidental checkin - thanks for watching me, Felix!
Add missing string
Merge branch 'public/7.7' into feature/wimp-flac

Change-Id: I924efa5987a8fa8c8ddfdfeaf296501258c0f804
Cache::BaseCache::Canonicalize_Expiration_Time would not return absolute
timestamps, but seconds from now only. We must always add the current
time, or the timestamp would end up in the past.
Merge branch 'feature/wimp-flac' into public/7.7
Merge branch 'public/7.7' into public/10.0