Add 2.5D Demo Projects

.github/CODEOWNERS

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+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+# Owners can be @users, @org/teams or emails
+
+/misc/2.5d           @aaronfranke
+/mono/2.5d           @aaronfranke

misc/2.5d/README.md

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+# 2.5D Demo Project (GDScript)
+
+This demo project shows a way to create a 2.5D game in Godot by mixing 2D and 3D nodes. It also adds a 2.5D editor viewport for easily editing 2.5D levels.
+
+Note: There is a Mono C# version available [here](https://github.com/godotengine/godot-demo-projects/tree/master/mono/2.5d).
+
+## How does it work?
+
+Custom node types are added in a Godot plugin to allow 2.5D objects. Node25D serves as the base for all 2.5D objects. Its first child must be a 3D Spatial, which is used to calculate its position. Then, add a 2D Sprite (or similar) to display the object.
+
+Inside of Node25D, a 2.5D transformation matrix made of three Vector2 is used to calculate the 2D position from the 3D position. For getting a 3D position, this project uses KinematicBody and StaticBody (3D), but these only exist for math - the camera is 2D and all sprites are 2D. You are able to use any Spatial node for math.
+
+Several view modes are implemented, including top down, front side, 45 degree, isometric, and two oblique modes. To implement a different view angle, all you need to do is create a new set of basis vectors in Node25D, use it on all instances, and of course create sprites to display that object in 2D.
+
+The plugin also adds YSort25D to sort Node25D nodes, and ShadowMath25D for calculating a shadow (a simple KinematicBody that tries to cast downward).
+
+## Screenshots
+
+![Forty Five Degrees](screenshots/forty_five.png)
+
+![Isometric](screenshots/isometric.png)
+
+![Oblique Z](screenshots/oblique_z.png)
+
+![Oblique Y](screenshots/oblique_y.png)
+
+![Front Side](screenshots/front_side.png)
+
+![Cube](screenshots/cube.png)
+
+![2.5D Editor Viewport](screenshots/editor.png)
+
+## Music License
+
+`assets/mr_mrs_robot.ogg` Copyright © circa 2008 Juan Linietsky, CC-BY: Attribution.

misc/2.5d/addons/node25d/.broken-gdscripts/Basis25D.gd

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+# Currently broken unless Godot makes this kind of thing possible:
+# https://github.com/godotengine/godot/issues/21461
+# https://github.com/godotengine/godot-proposals/issues/279
+
+# Basis25D structure for performing 2.5D transform math.
+# Note: All code assumes that Y is UP in 3D, and DOWN in 2D.
+# Meaning, a top-down view has a Y axis component of (0, 0), with a Z axis component of (0, 1).
+# For a front side view, Y is (0, -1) and Z is (0, 0).
+# Remember that Godot's 2D mode has the Y axis pointing DOWN on the screen.
+
+class_name Basis25D
+
+var x: Vector2 = Vector2()
+var y: Vector2 = Vector2()
+var z: Vector2 = Vector2()
+
+static func top_down():
+	return init(1, 0, 0, 0, 0, 1)
+
+static func front_side():
+	return init(1, 0, 0, -1, 0, 0)
+
+static func forty_five():
+	return init(1, 0, 0, -0.70710678118, 0, 0.70710678118)
+
+static func isometric():
+	return init(0.86602540378, 0.5, 0, -1, -0.86602540378, 0.5)
+
+static func oblique_y():
+	return init(1, 0, -1, -1, 0, 1)
+
+static func oblique_z():
+	return init(1, 0, 0, -1, -1, 1)
+
+# Creates a Dimetric Basis25D from the angle between the Y axis and the others.
+# Dimetric(2.09439510239) is the same as Isometric.
+# Try to keep this number away from a multiple of Tau/4 (or Pi/2) radians.
+static func dimetric(angle):
+	var sine = sin(angle)
+	var cosine = cos(angle)
+	return init(sine, -cosine, 0, -1, -sine, -cosine)
+
+static func init(xx, xy, yx, yy, zx, zy):
+	var xv = Vector2(xx, xy)
+	var yv = Vector2(yx, yy)
+	var zv = Vector2(zx, zy)
+	return Basis25D.new(xv, yv, zv)
+
+func _init(xAxis: Vector2, yAxis: Vector2, zAxis: Vector2):
+	x = xAxis
+	y = yAxis
+	z = zAxis

misc/2.5d/addons/node25d/.broken-gdscripts/Transform25D.gd

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+# Currently broken unless Godot makes this kind of thing possible:
+# https://github.com/godotengine/godot/issues/21461
+# https://github.com/godotengine/godot-proposals/issues/279
+
+# Calculates the 2D transformation from a 3D position and a Basis25D.
+
+class_name Transform25D
+
+var spatial_position: Vector3 = Vector3()
+var basis #: Basis25D
+
+func flat_transform():
+	return Transform2D(0, flat_position())
+
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+	var pos = spatial_position.x * basis.x
+	pos += spatial_position.y * basis.y
+	pos += spatial_position.z * basis.z
+	return pos
+
+func _init(basis25d):
+	basis = basis25d

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