Refactor to use jsdoc signatures for functions in modules

[LiamOSullivan]

Add jsdoc signatures for all functions in module files in public/javascripts/modules

See public/javascripts/modules/bcd-date.mjs for example of how to add a jsdoc function signature to functions.

See this cheat sheet for help or see full reference here

[LiamOSullivan]

See article