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/computecullandlod/indirectdraw.vert

@@ -1,42 +0,0 @@
-#version 450
-
-// Vertex attributes
-layout (location = 0) in vec4 inPos;
-layout (location = 1) in vec3 inNormal;
-layout (location = 2) in vec3 inColor;
-
-// Instanced attributes
-layout (location = 4) in vec3 instancePos;
-layout (location = 5) in float instanceScale;
-
-layout (binding = 0) uniform UBO 
-{
-	mat4 projection;
-	mat4 modelview;
-} ubo;
-
-layout (location = 0) out vec3 outNormal;
-layout (location = 1) out vec3 outColor;
-layout (location = 2) out vec3 outViewVec;
-layout (location = 3) out vec3 outLightVec;
-
-out gl_PerVertex
-{
-	vec4 gl_Position;
-};
-
-void main() 
-{
-	outColor = inColor;
-		
-	outNormal = inNormal;
-	
-	vec4 pos = vec4((inPos.xyz * instanceScale) + instancePos, 1.0);
-
-	gl_Position = ubo.projection * ubo.modelview * pos;
-	
-	vec4 wPos = ubo.modelview * vec4(pos.xyz, 1.0); 
-	vec4 lPos = vec4(0.0, 10.0, 50.0, 1.0);
-	outLightVec = lPos.xyz - pos.xyz;
-	outViewVec = -pos.xyz;	
-}