Update Gearlynx docs

Update Geargrafx docs

Update Gearsystem docs

Update Gearboy docs

Merge pull request #1131 from hunterk/master

Overhaul ppsspp.md

Add advanced HDR programming section

Cont: add syntax highlighting hints to code blocks

Add syntax highlight hints to code blocks

Add concluding FAQ

Add #pragma alias info

Add additional information in SLANG README not present, and caveats

Enhance documentation for Slang shaders and presets

Expand shader documentation with feedback and sampling details

Update tv.md