* GRIM: Use ScummVM's 2D API for blitting the TinyGL framebuffer
* MYST3: Use ScummVM's 2D API for blitting the TinyGL framebuffer
* ICB: Use ScummVM's 2D API for blitting the TinyGL framebuffer
Enabled system API for begin/end gfx transactions, initSize, setGraphicsMode.
Function setGraphicsMode will use optional params to trigger 3d rendering
and switch to proper SDL Gfx manager.