if you have the setting to NOT play cards to the stack enabled, it meant
that any spells (like Lightning Bolt) would be cast to the stack but no
arrow would show. This was an edge case I missed.

Users can now target from their hand. This will cast the card and point
to the target.

optionally destroy tokens on zone change; added multi arrows; card menu changes; arrow fixes; initial commit for attachCard code

arrows: clean all arrows when changing phase; arrow color dependent on modifier keys; remove a single arrow by rightclicking