* fixed -Wshadow warnings
 * throw() -> noexcept
 * fixed lua header includes (part 1)
 * lua.cpp/lua.hpp -> lua_unibot.cpp/lua_unibot.hpp (lua header include fix, part 2)
 * made data path and config file name configurable (via --datapath and --config arguments)
 * fixed and improved lua script loading (note: lua scripts have to be located in the data path now! - this is /etc/unibot/scripts per default)