Delay GL context initialization on ios.

I think it needs to have the widgets created for it to work.

Update appveyor.yml

Update appveyor.yml

Updated version.

Updated version.

Merge pull request #596 from sisco0/fix-compile-warning-reorder

Fixed initialization order at compile time

Updated version.

Fixed whitespace.

Fixed clang warning.

Changed default Linux POV-Ray output to png.