P3P3DS Builder 0.2.3

Speed work: removed per-call allocations in diagnostics code, fixed a memory leak (every GPU display list was kept forever), the 3DS renderer no longer flushes the whole 12 MiB GPU memory cache every frame and skips repeated presents of the same frame. The bottom-screen report now shows where time goes over the last 10 s. On PC the same route takes about half the host time; the effect on 3DS speed is not measured yet - reports welcome. Saves work, no sound yet.