[ox] Overhaul serialization/model system and add ModelValue/ModelObject/ModelUnion variant system

deps/ox/src/ox/std/CMakeLists.txt

@@ -24,6 +24,7 @@ add_library(
 		buffer.cpp
 		buildinfo.cpp
 		byteswap.cpp
+		concepts.cpp
 		fmt.cpp
 		heapmgr.cpp
 		math.cpp
@@ -73,6 +74,7 @@ install(
 		buffer.hpp
 		buildinfo.hpp
 		byteswap.hpp
+		concepts.hpp
 		def.hpp
 		defines.hpp
 		defer.hpp