* Collection: don't rely on the DONE_HINT to be issued before adding tracks

An examination of gio's source shows that:
- For linux/inotify this works (except for directories)
- Looking at kqueue/win32 , DONE_HINT is never issued
* Windows Installer: update mutagen version, remove old cruft
* Windows: typo that prevents x64 SDK from being properly detected
* Windows: Nobody wants to see that console window unless asked
* Windows installer: support 32-bit and 64-bit installations
* Collection: scan collections on startup, if enabled

- There will be some weirdness if someone switches between exaile versions,
  but there's not a better way to deal with it.
* Windows: add 64-bit version of patched directsoundsink

- Against GST 10.31 SDK
* LyricWiki: remove garbage from start of lyrics
* NormalPlayer: recover from pipeline errors

- Need to flush out the mainbin before using it again, otherwise it winds up in an indeterminate state
* NormalPlayer: Don't flush the MainBin if it's not playing, may result in a segfault