Fix mixer table validation for dupe CAN port numbers; highlight timer warnings even when port conflict exists.
Fix mixer table validation for dupe CAN port numbers;
highlight timer warnings even when port conflict exists.

hejunbok/qgroundcontrol_aq,hejunbok/qgroundcontrol_aq,AutoQuad/qgroundcontrol_aq,AutoQuad/qgroundcontrol_aq,AutoQuad/qgroundcontrol_aq,AutoQuad/qgroundcontrol_aq,hejunbok/qgroundcontrol_aq,hejunbok/qgroundcontrol_aq