0.2.0

Probe 0.2: shader variants, internal resolutions, shader cache

• Benchmark the specialised TEV variants the port draws with (built like
  pc_gx_tev.c), keeping the uber shader as a 1080p reference
• Render at 1080p, 720p and 480p into an off-screen target and upscale
• Report variant compile time and whether program binaries can be cached