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/shadowmapomni/offscreen.vert

@@ -0,0 +1,32 @@
+#version 450
+
+layout (location = 0) in vec3 inPos;
+
+layout (location = 0) out vec4 outPos;
+layout (location = 1) out vec3 outLightPos;
+
+layout (binding = 0) uniform UBO 
+{
+	mat4 projection;
+	mat4 view; 
+	mat4 model;
+	vec4 lightPos;
+} ubo;
+
+layout(push_constant) uniform PushConsts 
+{
+	mat4 view;
+} pushConsts;
+ 
+out gl_PerVertex 
+{
+	vec4 gl_Position;
+};
+ 
+void main()
+{
+	gl_Position = ubo.projection * pushConsts.view * ubo.model * vec4(inPos, 1.0);
+
+	outPos = vec4(inPos, 1.0);	
+	outLightPos = ubo.lightPos.xyz; 
+}