Fixed so the extension check is now case insensitive

Signed-off-by: Dan Printzell <xwildn00bx@gmail.com>
Merge pull request #10 from WildN00b/JpegFix

Fixed so the extension check is now case insensitive
fixed gtk2 problems and other stuff
Merge branch 'master' of https://github.com/lasarus/ImageToMap-X
Fixed Save Increment on windows, and greyed out the Render World button
Forgot to make a function not static