1377 help manual fix

[synthfi]

Changes

• Adds javafx.web as a dependency
• Adds a new form, ScrWebView, that opens a dialog with a WebView instance
  • 1 constructor for generic string url, 1 constructor for file
  • has a back button and a forward button
• Added second help option titled Help (Local), that unzips the help and opens it in a ScrWebView dialog
• minor cleanup, updates

Notes

• Unfortunately, it's not as easy as I thought it would be to get the ScrWebView to look good on all platforms. Some annoyances I have with it:
  • slower than traditional browsers
  • Offers only the basics out of the box. I implemented a back and forward button myself. UI scaling currently is not tied to the scaling of the rest of the app, which will take more work
  • Breaks the feature of clicking on CONTACT AUTHOR opening a draft email for the user. It looks like another thing I would have to implement
• As the issue this feature solves only affects a portion of users on linux, I figured that it would make sense to leave this as a fallback for those users. Unfortunately there is no way for me to programmatically tell if this is the case for any user

Draft:

• UI/UX testing on MacOS

Closes #1377

[synthfi]

view on linux:

this largely looks the same on windows & macos, albeit with the fonts on macos missing the characters for the back and forward buttons

[synthfi]

zoom isn't controllable, side scrolling apparently isn't implemented. At the very least it opens though.

With this I can at least give people who have issues with opening the help on snap-packaged browsers from being out of luck. (also in the extremely weird case of not having an installed browser lol)

I don't plan on keeping this weird setup around forever for sure. Just have it here for the 3.6 release