Add CoffeeScript dependency check to build script

Create compress-videos-to-webm-reasonable-size.sh

improvements to fizzytiles

minor comments on strokes in the RectangularAppearance class

minor comment tweak

adding a utility script to combine all .coffee files in a directory (recursively) into a single file. Useful to pass to ChatGPT for analysis.

minor comment typos

lots of comments and small tweaks to the calculateHash and Object::hashCode functions

added new SourceVault check to show references to non local private fields

adding a comment re need to use need to use a webserver that supports range requests if you want to scrub videos

added check - don't update scrubber if video is seeking. I don't think this does anything really.

changing the loading of privateVideosManifest.js file to use already existing code

debug writes / comments related to loading of .js files and boot process

fixing some of the promises' "then" steps in the boot process - now the source batches are actually completely loaded before they are compiled (some of the arrows were missing and there was one missing closure creation)

retry mechanism for loading .js files (3 times before bailing)