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/nv_ray_tracing_basic/closesthit.rchit

@@ -0,0 +1,12 @@
+#version 460
+#extension GL_NV_ray_tracing : require
+#extension GL_EXT_nonuniform_qualifier : enable
+
+layout(location = 0) rayPayloadInNV vec3 hitValue;
+hitAttributeNV vec3 attribs;
+
+void main()
+{
+  const vec3 barycentricCoords = vec3(1.0f - attribs.x - attribs.y, attribs.x, attribs.y);
+  hitValue = barycentricCoords;
+}

data/shaders/glsl/nv_ray_tracing_basic/miss.rmiss

@@ -0,0 +1,9 @@
+#version 460
+#extension GL_NV_ray_tracing : require
+
+layout(location = 0) rayPayloadInNV vec3 hitValue;
+
+void main()
+{
+    hitValue = vec3(0.0, 0.0, 0.2);
+}

data/shaders/glsl/nv_ray_tracing_basic/raygen.rgen

@@ -0,0 +1,32 @@
+#version 460
+#extension GL_NV_ray_tracing : require
+
+layout(binding = 0, set = 0) uniform accelerationStructureNV topLevelAS;
+layout(binding = 1, set = 0, rgba8) uniform image2D image;
+layout(binding = 2, set = 0) uniform CameraProperties 
+{
+	mat4 viewInverse;
+	mat4 projInverse;
+} cam;
+
+layout(location = 0) rayPayloadNV vec3 hitValue;
+
+void main() 
+{
+	const vec2 pixelCenter = vec2(gl_LaunchIDNV.xy) + vec2(0.5);
+	const vec2 inUV = pixelCenter/vec2(gl_LaunchSizeNV.xy);
+	vec2 d = inUV * 2.0 - 1.0;
+
+	vec4 origin = cam.viewInverse * vec4(0,0,0,1);
+	vec4 target = cam.projInverse * vec4(d.x, d.y, 1, 1) ;
+	vec4 direction = cam.viewInverse*vec4(normalize(target.xyz / target.w), 0) ;
+
+	uint rayFlags = gl_RayFlagsOpaqueNV;
+	uint cullMask = 0xff;
+	float tmin = 0.001;
+	float tmax = 10000.0;
+
+	traceNV(topLevelAS, rayFlags, cullMask, 0, 0, 0, origin.xyz, tmin, direction.xyz, tmax, 0);
+
+	imageStore(image, ivec2(gl_LaunchIDNV.xy), vec4(hitValue, 0.0));
+}