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/gears/gears.vert

@@ -1,31 +0,0 @@
-#version 450
-
-layout (location = 0) in vec4 inPos;
-layout (location = 1) in vec3 inNormal;
-layout (location = 2) in vec3 inColor;
-
-layout (binding = 0) uniform UBO 
-{
-	mat4 projection;
-	mat4 model;
-	mat4 normal;
-	mat4 view;
-	vec3 lightpos;
-} ubo;
-
-layout (location = 0) out vec3 outNormal;
-layout (location = 1) out vec3 outColor;
-layout (location = 2) out vec3 outEyePos;
-layout (location = 3) out vec3 outLightVec;
-
-void main() 
-{
-	outNormal = normalize(mat3(ubo.normal) * inNormal);
-	outColor = inColor;
-	mat4 modelView = ubo.view * ubo.model;
-	vec4 pos = modelView * inPos;	
-	outEyePos = vec3(modelView * pos);
-	vec4 lightPos = vec4(ubo.lightpos, 1.0) * modelView;
-	outLightVec = normalize(lightPos.xyz - outEyePos);
-	gl_Position = ubo.projection * pos;
-}