Add MonsterModel (tree model); add serialization to WeaponModel
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#	modified:   CMakeLists.txt
#	new file:   EnumSerialization.hpp
#	new file:   MonsterModel.cpp
#	new file:   MonsterModel.hpp
#	new file:   Serial.hpp
#	modified:   WeaponModel.cpp
#	modified:   WeaponModel.hpp
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#	../build/
