Added Gates

FIXUP: account for full gate footprint when updating neighbours.

FIXUP: gate-wall connection adjacency yaml.

mods/ts/rules/defaults.yaml

@@ -750,3 +750,52 @@
 	Inherits: ^TerrainOverlay
 	CustomSelectionSize:
 		CustomBounds: 220,220
+
+^Gate:
+	Inherits: ^Building
+	Valued:
+		Cost: 250
+	Health:
+		HP: 350
+	Armor:
+		Type: Heavy
+	LineBuildNode:
+		Types: wall, gate
+	-Building:
+	-Capturable:
+	-GivesBuildableArea:
+	-MustBeDestroyed:
+	-WithSpriteBody:
+	WithGateSpriteBody:
+	Power:
+	CanPowerDown:
+		IndicatorPalette: mouse
+	Tooltip:
+		Description: Automated barrier that opens for allied units.
+	Gate:
+		Adjacent: 4
+		BuildSounds: place2.aud
+		OpeningSound: gateup1.aud
+		ClosingSound: gatedwn1.aud
+		TerrainTypes: Clear, Rough, Road, DirtRoad, Green, Sand, Pavement
+		BlocksProjectilesHeight: 640
+
+^Gate_A:
+	Inherits: ^Gate
+	Gate:
+		Dimensions: 3,1
+		Footprint: xxx
+	WithGateSpriteBody:
+		WallConnections: -1,0, 3,0
+	LineBuildNode:
+		Connections: -1,0, 1,0
+
+^Gate_B:
+	Inherits: ^Gate
+	Gate:
+		Dimensions: 1,3
+		Footprint: x x x
+	WithGateSpriteBody:
+		WallConnections: 0,-1, 0,3
+	LineBuildNode:
+		Connections: 0,-1, 0,1