ADDED min_resolved_spokes constraint. ADDED "Thermal relief connection to zone incomplete" violation. Fixes https://gitlab.com/kicad/code/kicad/issues/2183
ADDED zone_connection constraint. ADDED thermal_relief_gap and thermal_spoke_width constraints. ADDED angle override for thermal relief spokes in Pad Properties. Fixes https://gitlab.com/kicad/code/kicad/issues/4067