refactor: globally allow all webdav methods

[EsadCetiner]

Nextcloud makes very heavy use of WebDAV methods, it's pretty much used everywhere even in the Web GUI. So much so about 1/3 of all rules were solely for allowing WebDAV methods. Now with this refactor, these methods are allowed globally within the plugin. This should be an big improvement in terms of maintenance and usability for the plugin.

I didn't test this for very long as existing test coverage should pick up any regressions, and this refactor is relatively simple.

• Reduced the number of lines of code by about 700.
• Number of rules has gone down from 169 to 103.
• A nice bonus is that some unsupported Nextcloud Apps may now be usable for more basic use cases at PL-1.
• The plugin will require significantly less maintenance in the long run, adding support for additional apps in the future will be easier too.
• Fixes a few false positives in supported apps thanks to the refactor.