Fix seeing double torrents in classic mode

Need to ignore torrent added events from state as they are already
loaded by _on_session_state
GTKUI: Remove add_row and use add_rows instead
GTKUI: More refactoring of filtertree translation text
GTKUI: Modify Show Zero Hits to apply to all filter categories
GTKUI: New path chooser to handle remote paths and store favorite paths
GTKUI: Asthetic updates to new path chooser options dialog
GTKUI: Fix layout issues with new path chooser in options tab
GTKUI: Display only folder not full path on path chooser