Drop polygon path finder demo

It is obsoleted by the easier NavigationPolygon API and the feature will likely be dropped in the future (see #3740)

demos/3d/polygon_path_finder/engine.cfg

@@ -1,5 +0,0 @@
-[application]
-
-name="Polygon Pathfinder"
-main_scene="res://poly_with_holes.scn"
-icon="res://icon.png"

demos/3d/polygon_path_finder/polygonpathfinder.gd

@@ -1,77 +0,0 @@
-
-extends Spatial
-
-
-func _ready():
-	var pf = PolygonPathFinder.new()
-	
-	var points = Vector2Array()
-	var connections = IntArray()
-	
-	# Poly 1
-	points.push_back(Vector2(0, 0))		# 0
-	points.push_back(Vector2(10, 0))	# 1
-	points.push_back(Vector2(10, 10))	# 2
-	points.push_back(Vector2(0, 10))	# 3
-	
-	connections.push_back(0) # Connect vertex 0...
-	connections.push_back(1) # ... to 1
-	drawLine(points[0], points[1], get_node("/root/Spatial/Polys"))
-	connections.push_back(1) # Connect vertex 1...
-	connections.push_back(2) # ... to 2
-	drawLine(points[1], points[2], get_node("/root/Spatial/Polys"))
-	connections.push_back(2) # Etc.
-	connections.push_back(3)
-	drawLine(points[2], points[3], get_node("/root/Spatial/Polys"))
-	connections.push_back(3) # Connect vertex 3...
-	connections.push_back(0) # ... back to vertex 0, to close the polygon
-	drawLine(points[3], points[0], get_node("/root/Spatial/Polys"))
-	
-	# Poly 2, as obstacle inside poly 1
-	points.push_back(Vector2(2, 0.5))	# 4
-	points.push_back(Vector2(4, 0.5))	# 5
-	points.push_back(Vector2(4, 9.5))	# 6
-	points.push_back(Vector2(2, 9.5))	# 7
-	
-	connections.push_back(4)
-	connections.push_back(5)
-	drawLine(points[4], points[5], get_node("/root/Spatial/Polys"))
-	connections.push_back(5)
-	connections.push_back(6)
-	drawLine(points[5], points[6], get_node("/root/Spatial/Polys"))
-	connections.push_back(6)
-	connections.push_back(7)
-	drawLine(points[6], points[7], get_node("/root/Spatial/Polys"))
-	connections.push_back(7)
-	connections.push_back(4)
-	drawLine(points[7], points[4], get_node("/root/Spatial/Polys"))
-	
-	print("points: ", points)
-	print("connections: ", connections)
-	
-	pf.setup(points, connections)
-	
-	var path = pf.find_path(Vector2(1, 5), Vector2(8, 5))
-	
-	var lastStep = null
-	print("path: ", path)
-	for step in path:
-		print("step: ", step)
-		if (lastStep != null):
-			var currPathSegment = Vector2Array()
-			drawLine(lastStep, step, get_node("/root/Spatial/Path"))
-		lastStep = step
-
-
-func drawLine(pointA, pointB, immediateGeo):
-	var drawPosY = 0.1
-	var im = immediateGeo
-	
-	im.begin(Mesh.PRIMITIVE_POINTS, null)
-	im.add_vertex(Vector3(pointA.x, drawPosY, pointA.y))
-	im.add_vertex(Vector3(pointB.x, drawPosY, pointB.y))
-	im.end()
-	im.begin(Mesh.PRIMITIVE_LINE_STRIP, null)
-	im.add_vertex(Vector3(pointA.x, drawPosY, pointA.y))
-	im.add_vertex(Vector3(pointB.x, drawPosY, pointB.y))
-	im.end()