no error if beginshutdown does not exist
Revert "provide the address of the C host code first calling lua"

It is not going to return always the top C host code.
Revert "disable tostring in luabridge because it doesn't use exceptions"

LuaBridge is unsafe to use in any case other than binding
move stackdumper in LuaException
build on eclipse
better error handling through lua_cppcall