v2.0

Refactor all main code.

1. Change floating window UI
2. Optimize code. The latest version keep the event loop delaying at about 0.0001

Download link(lanzou):
v2.0.exe: https://flt.lanzouy.com/ixxAu16z36he,
v2.0_nuitka.exe: https://flt.lanzouy.com/iIXeY16z4d5a