fx.io: convert to assembly build system

CMakeLists.txt

@@ -11,7 +11,8 @@ set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
 set(fx_all_assemblies
 	fx.runtime
-	fx.collections)
+	fx.collections
+	fx.io)
 
 if (NOT DEFINED fx_assemblies)
 	set(fx_assemblies ${fx_all_assemblies})
@@ -51,4 +52,11 @@ if ("fx.collections" IN_LIST fx_assemblies)
 		DEPENDENCIES fx.runtime)
 endif ()
 
+if ("fx.io" IN_LIST fx_assemblies)
+	add_fx_assembly(
+		NAME fx.io
+		NAMESPACES fx.io
+		DEPENDENCIES fx.runtime)
+endif ()
+
 add_executable(dynamic-test test/dynamic-test.c)