Right click option to override default delimiter

[videogameaholic]

Added virtual file level settings separate from the defaults defined in Settings. Added actions to the editor and tab to change the delimiter for that file.

[videogameaholic]

I think I like this implementation better than the other pull request. In this one, I'm using the user data feature of VirtualFile which I think is the preferred method as opposed to adding a class variable to CsvFile. This has the same effect: Individual files can use a delimiter other than the global default. This also opens it up to other file types. TSV/TXT are not rainbowtized by default but they are available to the right click options.