Performance release

This release has the following features:

 1) fix to minecraft rendering crash
 2) large models support works better
 3) concurrent zip file decoding done with multiple cpu's using pthreads => significant perf impact on .zip files
 4) concurrent image file/png/jpeg decoding in multiple cpu's using pthreads => significant perf impact on texture decoding
 5) documentation improvements
 6) feat.php featurelist added
 7) ad.php chatgpt generated adverticement page added.
 8) borders in 3d viewer and the engine are working alot better/now border glichest are almost completely gone
 9) firefox mobile fixes
10) android/mobile progressbar logo fixed
11) upgraded to newer emscripten. Looks like it required compile-time flag -emit-llvm or everything was broken
12) fbo fixes
13) add _html5 to zip filenames to indicate that there's html5 content in the zip