v0.10.0

New surface: make-render-target / with-render-target / draw-render-target / render-target->texture, load-shader / with-shader / set-shader-uniform with auto-uniforms utime + uresolution.

Verified end-to-end via cinder-cantata bloom proof-of-concept (held at 60 FPS). Bloom kernel quality refinement (currently 5x5 box) tracked at sigil-graphics-bloom-quality-pass.