[escripten] wasm port

[ololoken]

Demo available here https://turch.in/quakespasm/index.html running mod Travail.

Also build depends on external library https://github.com/ptitSeb/gl4es

[sezero]

I pushed a clean-up patch to your branch, which also fixes the mac Xcode builds: Please make sure that all are OK.

The makefile can possibly be cleaned-up further but whatever..

[ololoken]

@sezero thanks, everything is ok.

[sezero]

OK then, I'll pull this in shortly.

Note, however, I have no knowledge of wasm stuff: Would you be willing to maintain the wasm/emcripten port ?

[ololoken]

sure, initially I was going to add gh-page for wasm build deployment, but there are two problems: find working shareware/demo files; and more complex problem with http headers to enable ArraySharedBuffer js API for pthread emulation.
Long story short to run playable web demo you need configure deployment pipeline to own server. I will push wasm build launcher with cicd example shortly, just need to make some cleanups.

[sezero]

OK, this is in now. Send patches for any future improvements.

Thanks.