Merge tag '0.0.4' into develop
Added u8 vertex attributes
Added hardcoded animated flat names.
Added animated flats rendering.
Merge branch 'feature/animated_flats' into develop

Animated flats using the vertex shader and two more attributes.
Moved wall scrolling to vertex shader.
Added u8 vertex attributes
Added hardcoded animated flat names.
Added animated flats rendering.
Moved wall scrolling to vertex shader.
Removed random shuffle.
Added animation in wall shader & VBO.
Animated walls rendering.
Merge branch 'develop' of github.com:cristicbz/rust-doom into develop

Conflicts:
	src/shaders/flat.fragment.glsl
	src/shaders/flat.vertex.glsl
	src/shaders/wall.fragment.glsl
	src/shaders/wall.vertex.glsl
	src/wad/tex.rs
	src/wad/util.rs
Updated progress & version number to 0.0.5
Fixed conflict resolution leftovers.
Fixed polygon seams & holes issue.
Merge branch 'release/0.0.5'

Change log:
* Animated flats!
* Animated walls!
* Finally fixed stupid issue with missing polys and visible seams (using an
  additional convexity defect removal step + fattening polys with a tiny tiny
  bias)