This commit will bring:
- Gapless play! (Fix#739)
- Chunked queue shuffling - we play first track after first 50 queue items are shuffled, then we shuffle chunks of 50 queue items with each new animation frame.
- We can now restore original queue order after shuffling! (Part of #1506)
- Preloading whole tracks into LRU cache (Should fix#1812)
- Preloading multiple tracks at once