Add a template to improve UEF units

.github/ISSUE_TEMPLATE/improve-uef.md

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+---
+name: Unit improvements for the UEF
+about: Suggest visual improvements to a unit that belongs to the UEF
+title: ""
+labels: "graphics"
+assignees: ""
+---
+
+## Lua script related issues
+
+## Texture related issues
+
+- [ ] Correct albedo intensity
+- [ ] Correct team color channel
+- [ ] Correct roughness channel
+- [ ] Correct metallic channel(s)
+- [ ] Correct are wrong
+
+## Mesh/bone related issues
+
+- [ ] Bones for target recoil exist
+- [ ] Bones for targeting exist (only relevant for large units)
+
+## Relevant shaders
+
+You can find all relevant shaders in [mesh.fx](/effects/mesh.fx).
+
+- Mesh shader techniques: `Unit_HighFidelity` / `Unit_MedFidelity` / `Unit_LowFidelity`
+- Shield shader techniques: `ShieldUEF_MedFidelity` / `ShieldUEF_LowFidelity`
+
+### Relevant texture interpretations
+
+| Mesh shaders | R         | G         | B        | A                                           |
+| ------------ | --------- | --------- | -------- | ------------------------------------------- |
+| Albedo       | R         | G         | B        | Unused                                      |
+| Normals      | Unused    | Y         | Unused   | X                                           |
+| Spec         | Roughness | Roughness | Emission | Team color / Metallic + roughness reduction |