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/geometryshader/normaldebug.geom

@@ -0,0 +1,34 @@
+#version 450
+
+layout (triangles) in;
+layout (line_strip, max_vertices = 6) out;
+
+layout (binding = 1) uniform UBO 
+{
+	mat4 projection;
+	mat4 model;
+} ubo;
+
+layout (location = 0) in vec3 inNormal[];
+
+layout (location = 0) out vec3 outColor;
+
+void main(void)
+{	
+	float normalLength = 0.02;
+	for(int i=0; i<gl_in.length(); i++)
+	{
+		vec3 pos = gl_in[i].gl_Position.xyz;
+		vec3 normal = inNormal[i].xyz;
+
+		gl_Position = ubo.projection * (ubo.model * vec4(pos, 1.0));
+		outColor = vec3(1.0, 0.0, 0.0);
+		EmitVertex();
+
+		gl_Position = ubo.projection * (ubo.model * vec4(pos + normal * normalLength, 1.0));
+		outColor = vec3(0.0, 0.0, 1.0);
+		EmitVertex();
+
+		EndPrimitive();
+	}
+}