vlc.js update

• add code for offscreen canvas and emscripten fs
• add the ability to change libvlc options before the main is executed
• patches are applied to 4deb73b6f62ce8fe8dea84ab0b0a138b79af4550 (passes the ci without breaking other platforms)
• prepare patches for vlc upstream
• change the build script to support libvlc "in tree" build
• add build archive to simplify deployment

TODO:

• wip patches will be removed in the MR and hopefully, the tested hash updated
• update readme and table for the browser instructions

mentioned in issue #5 (closed)

mentioned in issue #6 (closed)

mentioned in issue #2 (closed)

mentioned in issue #1 (closed)

mentioned in issue #8 (closed)

mentioned in merge request !6 (closed)

mentioned in issue #14

superseded by !8 (closed) ?

closed