Move shaders into glsl and hlsl directories

Move `data/shaders` to `data/shaders/glsl`
Move `data/hlsl` to `data/shaders/hlsl`

Fix up shader paths in the cpp files to point to the new glsl location.

`data/shaders/hlsl/compile.py` still overwrites the glsl .spv files (for
now).

Issue: #723

data/shaders/parallaxmapping/parallax.vert

@@ -1,37 +0,0 @@
-#version 450
-
-layout (location = 0) in vec3 inPos;
-layout (location = 1) in vec2 inUV;
-layout (location = 2) in vec3 inNormal;
-layout (location = 3) in vec3 inTangent;
-layout (location = 4) in vec3 inBiTangent;
-
-layout (binding = 0) uniform UBO 
-{
-	mat4 projection;
-	mat4 view;
-	mat4 model;
-	vec4 lightPos;
-	vec4 cameraPos;
-} ubo;
-
-layout (location = 0) out vec2 outUV;
-layout (location = 1) out vec3 outTangentLightPos;
-layout (location = 2) out vec3 outTangentViewPos;
-layout (location = 3) out vec3 outTangentFragPos;
-
-void main(void) 
-{
-	gl_Position = ubo.projection * ubo.view * ubo.model * vec4(inPos, 1.0f);
-	outTangentFragPos = vec3(ubo.model * vec4(inPos, 1.0));   
-	outUV = inUV;
-		
-	vec3 T = normalize(mat3(ubo.model) * inTangent);
-	vec3 B = normalize(mat3(ubo.model) * inBiTangent);
-	vec3 N = normalize(mat3(ubo.model) * inNormal);
-	mat3 TBN = transpose(mat3(T, B, N));
-
-	outTangentLightPos = TBN * ubo.lightPos.xyz;
-	outTangentViewPos  = TBN * ubo.cameraPos.xyz;
-	outTangentFragPos  = TBN * outTangentFragPos;
-}