Add WORKERFS support (#581)

* README.md update

* Workflow update

* Action update

* Workflow update

* Workflow update

* Added workerLoadURL to FFMessageLoadConfig

* Add WORKERFS support

* Imported WORKERFS types

* Import WORKERFS types

* Action update

* Type updates

* Export update

* Updated classes

* Package together workflow  update

* Cleanup

* Restore CI.yml to upstream

* Restore README.md to upstream

* Restore classes.ts changes that are not related tp WORKERFS

* Restore types.ts changes unrelated to WORERFS

* Restore const.ts changes unrelated to WORKERFS

* Updated mount to support any enabled filesystems.

---------

Co-authored-by: Todd <todd@3dgamemarket.net>

build/ffmpeg-wasm.sh

@@ -39,6 +39,7 @@ CONF_FLAGS=(
   -sEXPORT_NAME="$EXPORT_NAME"             # required in browser env, so that user can access this module from window object
   -sEXPORTED_FUNCTIONS=$(node src/bind/ffmpeg/export.js) # exported functions
   -sEXPORTED_RUNTIME_METHODS=$(node src/bind/ffmpeg/export-runtime.js) # exported built-in functions
+  -lworkerfs.js
   --pre-js src/bind/ffmpeg/bind.js        # extra bindings, contains most of the ffmpeg.wasm javascript code
   # ffmpeg source code
   src/fftools/cmdutils.c