Major: 0.4.10

Updates:
1. Tweak the search policy of the category tab.
Major: 0.4.11

New Features:
1. Now song tab list can get focus easily.
Major: 0.4.12

Updates:
1. Tweak the shortcut keys.
Major: 0.4.13

New Features:
1. Support import iTunes playlist file.
Major: 0.4.13

Updates:
1. Reused sse3.
2. Merge dev.