Fake interior texture for Bevy

Based off the Godot shader from here: https://github.com/OBKF/Fake-Interior-Shader-for-GodotEngine The example textures are also from that repo.

Versions

• Bevy 0.15: bevy_fake_interior = "0.2"
• Bevy 0.14: bevy_fake_interior = "0.1"
• Bevy 0.13: bevy_fake_interior = "0.0.2"
• Bevy 0.12: bevy_fake_interior = "0.0.1"

lib.rs:

A shader and a material that uses it.