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/particlefire/normalmap.frag

@@ -0,0 +1,41 @@
+#version 450
+
+layout (binding = 1) uniform sampler2D sColorMap;
+layout (binding = 2) uniform sampler2D sNormalHeightMap;
+
+#define lightRadius 45.0
+
+layout (location = 0) in vec2 inUV;
+layout (location = 1) in vec3 inLightVec;
+layout (location = 2) in vec3 inLightVecB;
+layout (location = 3) in vec3 inLightDir;
+layout (location = 4) in vec3 inViewVec;
+
+layout (location = 0) out vec4 outFragColor;
+
+void main(void) 
+{
+	vec3 specularColor = vec3(0.85, 0.5, 0.0);
+
+	float invRadius = 1.0/lightRadius;
+	float ambient = 0.25;
+
+	vec3 rgb, normal;
+
+	rgb = texture(sColorMap, inUV).rgb;
+	normal = normalize((texture(sNormalHeightMap, inUV).rgb - 0.5) * 2.0);
+
+	float distSqr = dot(inLightVecB, inLightVecB);
+	vec3 lVec = inLightVecB * inversesqrt(distSqr);
+
+	float atten = max(clamp(1.0 - invRadius * sqrt(distSqr), 0.0, 1.0), ambient);
+	float diffuse = clamp(dot(lVec, normal), 0.0, 1.0);
+
+	vec3 light = normalize(-inLightVec);
+	vec3 view = normalize(inViewVec);
+	vec3 reflectDir = reflect(-light, normal);
+		
+	float specular = pow(max(dot(view, reflectDir), 0.0), 4.0);
+	
+	outFragColor = vec4((rgb * atten + (diffuse * rgb + 0.5 * specular * specularColor.rgb)) * atten, 1.0);   
+}