[Docs] reload api js files on change

[hasezoey]

Summary

This PR changes the documentation to be able to re-load the api js file to reflect any changes, previously api would be reload-able, but the reload would not reflect any changes from the original js file, only if the pug files were changed

in more detail:

• changes the parse function in docs/source/api to be in 3 different functions:
  • process the properties processFile
  • load a file with dox and process file parseFile
  • load and process all defined files parseAllFiles
• removes the global storage of the raw js parsed js files in docs/source/api (because it only needs to be loaded once and on reload would need to reload the anyway)
• update scripts/website to be able to use the reload function
• fix a accidental wrong type import in docs/source/utils.js from a previous PR

PS: the current approach is a little "hacky" because the docs/source/api file will always load it once at file-load time and the file-map docs/source/index will always store this one value and not update on reload, but the filemap.apiDocs value will update, this means that unless specifically loaded, the file-maps value will never update beyond the initial load - which should not pose a problem with the way the documentation is currently done (and for any scripts which will not make use of reload)

[vkarpov15]

Thanks 👍