Allow ponymotes input from comments

[DerVerruckteFuchs]

It's great that Slide supports viewing ponymotes, but it is less than ideal to require copypasting them from the ponymotes app to add them to a comment being created in slide. An (optional) ponymotes button that can be enabled in settings that could be available during the creation of comments would help immensely.

When pressing the ponymotes button it could bring up a default list of ponymotes and allow search for specific/other ponymotes like the betterponymotes browser extension.