* ReplayGain scanner improvements:
- Improved speed.
- No longer ignores up to 100ms of last audio data.
* Faster SSE-optimized codepaths for various sample type conversions; most notably more efficient handling of 24-bit content.
* Option to verify integrity of played files and report errors immediately (however it does not check whole-file checksums).
* Fixed status bar glitch with misplaced volume icon.