Shader: Use GetShader/Programiv instead of GetObjectParameterivARB

The former are core 2.0 while the latter is part of GL_ARB_shader_objects.
Print SDL error message if window creation fails
Graphics: Remove dubious optimization
Graphics: Properly initialize uniform before drawing
MRI-Binding: Add some RGSS2 Graphics bindings
GLMeta: Add framebuffer blitting support
GLMeta: "Finish" -> "End"
gl-util.h: Remove wrappers for things abstracted via GLMeta
MRI-Binding: Properly init Bitmap in Graphics#snap_to_bitmap
Plane: Don't set dirty flags when settings props to existing value
MRI-Binding: Bitmap#get_pixel always returns a Color object