Stopped using <vector> and using the microcontroller friendly MVector module instead, closes #169. Fixed memory leak, 'Option* help = new Option('h', 'help', NULL, 'Prints help for the command.', false)' at src/Cmd.cpp: 103, closes #171. Fixed memory leak, 'this->cmdHelp = new Cmd('help', &HelpCmdCallback, 'Returns information about all registered commands.')' on src/Rx.Cpp: 774 is never freed, closes #170. Fixed memory leak, new CmdGroup() called in Comm constructor but never freed, closes #151.