Major change since v0.1.0.

1. FDroid onboard.
2. Remove Xidian Dir, replaced with school contact.
3. Creative and commercialization project query.
4. Lots of WebView function.
5. Empty classroom query.
6. A little tool subwindow.

Details：https://superbart.xyz/p/traintime-pda-v0.2.0-release-note.html