Split engine to packages NazaraUtils and NZSL (#375)

* Move code to NazaraUtils and NZSL packages

* Reorder includes

* Tests: Remove glslang and spirv-tools deps

* Tests: Remove glslang init

* Remove NazaraUtils tests and fix Vector4Test

* Fix Linux compilation

* Update msys2-build.yml

* Fix assimp package

* Update xmake.lua

* Update xmake.lua

* Fix shader compilation on MinGW

* Final fixes

* The final fix 2: the fix strikes back!

* Disable cache on CI

* The return of the fix™️

xmake/actions/compile_shaders.lua

@@ -0,0 +1,27 @@
+task("compile-shaders")
+
+	set_menu({
+		-- Settings menu usage
+		usage = "xmake compile-shaders [options]",
+		description = "Compile engine shaders"
+	})
+
+	on_run(function ()
+		import("core.project.project")
+		local nzsl = path.join(project.required_package("nzsl"):installdir(), "bin", "nzslc")
+
+		local envs
+		if is_plat("mingw") then
+			local mingw = toolchain.load("mingw")
+			if mingw and mingw:check() then
+				envs = mingw:runenvs()
+			end
+		end
+		
+		print("Compiling shaders...")
+		for _, filepath in pairs(os.files("src/Nazara/*/Resources/**.nzsl")) do
+			print(" - Compiling " .. filepath)
+			local argv = {"--compile=nzslb", "--partial", "--header-file", filepath }
+			os.execv(nzsl, argv, { envs = envs })
+		end
+	end)