New features:

• Resize functions for Image (bilinear, bicubic, nearest).
• Added dpi information to GPI_Surface::Info.
• Added Image::Convert.
• Added Image::Flip.

Issues fixed:

• Fixed problem with not sending touch up if paused and possible crash (android).
• Fixed freeze in GPI_Surface while exiting under windows.
• Fixed problem with Texture when stride set to zero.
• Fixed problem with surface resize under windows.
• Fixed incorrect alignment for texture upload.
• Fixed AnimationManager incorrect start time for animation.
• Removed need to explicitly specify type for some mat4 functions.