Add canal constructions

[Idhrendur]

This block has been added to common/on_actions/00_on_actions.txt, and needs to be replicated:

	on_startup = {
		effect = {
			# Add Canals
			IF = {
				limit = {
					has_dlc = "Gotterdammerung" 
				}
				58 = {
					add_building_construction = {
						type = canal_kiel
						level = 1
						instant_build = yes
						province =  6389
					}
				}
				685 = {
					add_building_construction = {
						type = canal_panama
						level = 1
						instant_build = yes
						province =  7617
					}
				}
			}
		}
	}