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/glsl/deferredmultisampling/deferred.frag

@@ -0,0 +1,100 @@
+#version 450
+
+layout (binding = 1) uniform sampler2DMS samplerPosition;
+layout (binding = 2) uniform sampler2DMS samplerNormal;
+layout (binding = 3) uniform sampler2DMS samplerAlbedo;
+
+layout (location = 0) in vec2 inUV;
+
+layout (location = 0) out vec4 outFragcolor;
+
+struct Light {
+	vec4 position;
+	vec3 color;
+	float radius;
+};
+
+layout (binding = 4) uniform UBO 
+{
+	Light lights[6];
+	vec4 viewPos;
+	ivec2 windowSize;
+} ubo;
+
+layout (constant_id = 0) const int NUM_SAMPLES = 8;
+
+#define NUM_LIGHTS 6
+
+// Manual resolve for MSAA samples 
+vec4 resolve(sampler2DMS tex, ivec2 uv)
+{
+	vec4 result = vec4(0.0);	   
+	for (int i = 0; i < NUM_SAMPLES; i++)
+	{
+		vec4 val = texelFetch(tex, uv, i); 
+		result += val;
+	}    
+	// Average resolved samples
+	return result / float(NUM_SAMPLES);
+}
+
+vec3 calculateLighting(vec3 pos, vec3 normal, vec4 albedo)
+{
+	vec3 result = vec3(0.0);
+
+	for(int i = 0; i < NUM_LIGHTS; ++i)
+	{
+		// Vector to light
+		vec3 L = ubo.lights[i].position.xyz - pos;
+		// Distance from light to fragment position
+		float dist = length(L);
+
+		// Viewer to fragment
+		vec3 V = ubo.viewPos.xyz - pos;
+		V = normalize(V);
+		
+		// Light to fragment
+		L = normalize(L);
+
+		// Attenuation
+		float atten = ubo.lights[i].radius / (pow(dist, 2.0) + 1.0);
+
+		// Diffuse part
+		vec3 N = normalize(normal);
+		float NdotL = max(0.0, dot(N, L));
+		vec3 diff = ubo.lights[i].color * albedo.rgb * NdotL * atten;
+
+		// Specular part
+		vec3 R = reflect(-L, N);
+		float NdotR = max(0.0, dot(R, V));
+		vec3 spec = ubo.lights[i].color * albedo.a * pow(NdotR, 8.0) * atten;
+
+		result += diff + spec;	
+	}
+	return result;
+}
+
+void main() 
+{
+	ivec2 attDim = textureSize(samplerPosition);
+	ivec2 UV = ivec2(inUV * attDim);
+	
+	#define ambient 0.15
+
+	// Ambient part
+	vec4 alb = resolve(samplerAlbedo, UV);
+	vec3 fragColor = vec3(0.0);
+	
+	// Calualte lighting for every MSAA sample
+	for (int i = 0; i < NUM_SAMPLES; i++)
+	{ 
+		vec3 pos = texelFetch(samplerPosition, UV, i).rgb;
+		vec3 normal = texelFetch(samplerNormal, UV, i).rgb;
+		vec4 albedo = texelFetch(samplerAlbedo, UV, i);
+		fragColor += calculateLighting(pos, normal, albedo);
+	}
+
+	fragColor = (alb.rgb * ambient) + fragColor / float(NUM_SAMPLES);
+   
+	outFragcolor = vec4(fragColor, 1.0);	
+}