* refactor: Move ScreenshotHelper png parsing to PNGHelper, simplify interface
* refactor: Fix references to screenshotmanager
* fix: Read resolution, not description
* refactor: Rewrite/move all png reading logic into new class
* refactor: Integrate new metadata helper functions
* refactor: Add docs, re-add legacy mods support, change error handling
There are no longer specific errors for each metadata type as it was
just super unnecessary; A verbose log including the exception/string is
now logged to file instead and a generic error is given in the UI.
* fix: Show old vrc beta format images
They were being treated as a non-image