Replaced FFP code that sets up orthogonal projection with explicit matrix calculation. Storing the orthogonal projection in the projection matrix for legacy GL (1.x) rather than in the modelview matrix.

android: add missing graphics, only placeholders tho..

Refactored TTexture to allow encoding sprite(s) at an arbitrary location within a (possibly shared) physical texture. The original variant only allowed encoding a sprite at the bottomleft of a larger physical texture to use NPOT sprites on POT only supporting systems.