RQ/Renderer optimizations

[levibyte]

Just placeholders for ideas.

• Multithreaded RQ ( get..() functions? )

• Internal paint engine of shapes instead of default QPainer ? ( drawing on pixmap then putting into canvas as ? )

• Divide&Conqureror (Multithreaded) rendering. Render by 4 blocks?

• Rendering filter ( don't draw anything smaller than X pixels )

• Clumping? ( render very small objects in large viewports as 1 single block => clump )

• Canvas , no paint engine rendering updates if nothing has been changed in design

• Canvas, put the cached image of the viewport when doing interactive commands

• Other???