[Transparency] [OSX] change shader, to ouput the alpha value, set the background color according to opacity
[Transparency] [WIN] update the local window's style variable OnStyleChanging, handle ResetWindowRegion and OnNCCalcSize on transparency (WS_EX_COMPOSITED),
[Transparency] add switch to disable the code
Merge pull request #27 from jtg-gg/transparency-rebase

Transparency rebase