Upstream current patches

• Core patches

• static build, with core compiling on wasm32-.-emscripten target allowing modules to be linked correctly (cf -pthread on both CFLAGS and CXXFLAGS)

• meson, cmake, autotools configuration for contribs

• ci with artifacts

• bump the emsdk (if necessary, currently freezed to 2.0.0)

• video module

• standard mode with -s OFFSCREEN_FRAMEBUFFER

• patches for the core to enable -s OFFSCREEN_CANVAS_SUPPORT

• audio module

• Fix issue with TimeGet

• access module

• choosing one media for playback with the Native FS api, and the compat. mode for Firefox.