Improve filter identification, and don't parse invalid filters in interactive mode

Created by: attfarhan

This PR improves identifying text filters in interactive mode. Previously, we didn't check whether a parsed filter was actually valid, we only checked that it was not a finite filter. Now, we check to make sure the filter is valid in isTextFilter, so that when we parse filters in interactive mode, invalid filters will not appear in the selected filters bar.

This PR also properly identifies aliases. Previously, the shorthand f: and r: filters didn't work. Now, since we're ensuring the filter is validated using the aliases list in the parser, we won't miss out on any aliases. Also added -r and -f as identified negated filters.