adding D3D11 unit tests, removing raw HLSL support

Tests/xmake.lua

@@ -2,6 +2,7 @@ local Backend = {
 	VULKAN = 1,
 	OPENGL = 2,
 	OPENGL_ES = 3,
+	D3D11 = 4,
 }
 
 local nzsl_included = false
@@ -143,6 +144,9 @@ local tests = {
 			add_files("**.nzsl")
 		end
 	},
+	D3D11 = {
+		option = "d3d11",
+	},
 	WebGPU = {
 		option = "webgpu",
 		global_custom = function()