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/deferred/debug.frag

@@ -1,23 +0,0 @@
-#version 450
-
-layout (binding = 1) uniform sampler2D samplerPosition;
-layout (binding = 2) uniform sampler2D samplerNormal;
-layout (binding = 3) uniform sampler2D samplerAlbedo;
-
-layout (location = 0) in vec3 inUV;
-
-layout (location = 0) out vec4 outFragColor;
-
-void main() 
-{
-	vec3 components[3];
-	components[0] = texture(samplerPosition, inUV.st).rgb;  
-	components[1] = texture(samplerNormal, inUV.st).rgb;  
-	components[2] = texture(samplerAlbedo, inUV.st).rgb;  
-	// Uncomment to display specular component
-	//components[2] = vec3(texture(samplerAlbedo, inUV.st).a);  
-	
-	// Select component depending on z coordinate of quad
-	highp int index = int(inUV.z);
-	outFragColor.rgb = components[index];
-}