Displacement map prototype (#26709)

Requires https://github.com/space-wizards/RobustToolbox/pull/5023

This uses the new engine features (above) to add a displacement map shader. This allows deforming a sprite based on another sprite.

Primary use case is automatically adapting human clothing sprites to different species, something we want to make species like Vox a reality.

A basic example of wiring this up with Vox has been added. The system is however incredibly simple and **will** need more work by a content developer to select and toggle displacement maps when appropriate. I am leaving that to somebody else. For example right now the displacement map is applied even if a species already has custom-fit sprites for a piece of clothing, such as the grey jumpsuit for Vox.

Basic Aseprite plugins to help with authoring displacement maps have also been made.

Resources/Prototypes/Entities/Mobs/Species/vox.yml

@@ -16,6 +16,17 @@
     #- type: VoxAccent # Not yet coded
   - type: Inventory
     speciesId: vox
+    jumpsuitShader: DisplacedStencilDraw
+    displacements:
+      jumpsuit:
+        layer:
+          sprite: Mobs/Species/Vox/displacement.rsi
+          state: jumpsuit
+          copyToShaderParameters:
+            # Value required, provide a dummy. Gets overridden when applied.
+            layerKey: dummy
+            parameterTexture: displacementMap
+            parameterUV: displacementUV
   - type: Speech
     speechVerb: Vox
     speechSounds: Vox

Resources/Prototypes/Shaders/displacement.yml

@@ -0,0 +1,10 @@
+- type: shader
+  id: DisplacedStencilDraw
+  kind: source
+  path: "/Textures/Shaders/displacement.swsl"
+  stencil:
+    ref: 1
+    op: Keep
+    func: NotEqual
+  params:
+    displacementSize: 127