Revert "Add `platform_display` impls for win32 and android"
Add appveyor configuration file
Add opengl32.a and gdi32.a
Merge pull request #69 from tomaka/revert-68-fix-native-win

[WIP] Fix platform_display behavior on android and win32
Test now less restrictive
Merge pull request #73 from tomaka/app-appveyor-cfg

Add appveyor configuration file
Add `with_vsync` to WindowBuilder, plus the win32 implementation