Eradicate global base_class registrations to prevent problems with threading and general memory management issues with knowing how and when to clean them up.
Merge branch 'master' into ChaiScript_5_0_CPP_11

Conflicts:
	include/chaiscript/dispatchkit/bootstrap.hpp
	include/chaiscript/dispatchkit/boxed_cast.hpp
	include/chaiscript/dispatchkit/boxed_cast_helper.hpp
	include/chaiscript/dispatchkit/dynamic_cast_conversion.hpp
	include/chaiscript/dispatchkit/dynamic_object.hpp
	include/chaiscript/dispatchkit/exception_specification.hpp
	include/chaiscript/dispatchkit/function_call.hpp
	include/chaiscript/dispatchkit/function_call_detail.hpp
	include/chaiscript/dispatchkit/proxy_functions.hpp
	include/chaiscript/dispatchkit/proxy_functions_detail.hpp
	include/chaiscript/language/chaiscript_engine.hpp
	include/chaiscript/language/chaiscript_eval.hpp
Merge branch 'ChaiScript_5_0_CPP_11' of https://github.com/ChaiScript/ChaiScript into ChaiScript_5_0_CPP_11