Fixed undefined reference errors

[mnksnz]

When I tried to compile your package I got undefined reference error on my machine (Ubuntu 18.04, Melodic). This can be easily fixed by adding rqt_gui_cpp rqt_gui in find_package. Additionally, I fixed some minor issues using catkin_lint. :)

This was the undefined reference error I got:
CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o: In function `aeplanner::AEPlannerNodelet::onInit()': /home/naazare/ros/src/aeplanner/aeplanner/src/aeplanner_nodelet.cpp:12: undefined reference to `nodelet::Nodelet::getMTNodeHandle() const' CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o: In function `aeplanner::AEPlannerNodelet::~AEPlannerNodelet()': /home/naazare/ros/src/aeplanner/aeplanner/src/aeplanner_nodelet.cpp:15: undefined reference to `nodelet::Nodelet::~Nodelet()' CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o: In function `class_loader::impl::MetaObject<aeplanner::AEPlannerNodelet, nodelet::Nodelet>::create() const': /home/naazare/ros/src/aeplanner/aeplanner/include/aeplanner/aeplanner_nodelet.h:10: undefined reference to `nodelet::Nodelet::Nodelet()' CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o: In function `void class_loader::impl::registerPlugin<aeplanner::AEPlannerNodelet, nodelet::Nodelet>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': /opt/ros/melodic/include/class_loader/class_loader_core.hpp:177: undefined reference to `class_loader::impl::getCurrentlyLoadingLibraryName[abi:cxx11]()' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:177: undefined reference to `class_loader::impl::getCurrentlyActiveClassLoader()' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:183: undefined reference to `class_loader::impl::getCurrentlyActiveClassLoader()' CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o: In function `void class_loader::impl::registerPlugin<aeplanner::AEPlannerNodelet, nodelet::Nodelet>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': /opt/ros/melodic/include/class_loader/meta_object.hpp:153: undefined reference to `class_loader::impl::AbstractMetaObjectBase::AbstractMetaObjectBase(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /opt/ros/melodic/include/class_loader/meta_object.hpp:155: undefined reference to `typeinfo for nodelet::Nodelet' CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o: In function `void class_loader::impl::registerPlugin<aeplanner::AEPlannerNodelet, nodelet::Nodelet>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': /opt/ros/melodic/include/class_loader/class_loader_core.hpp:206: undefined reference to `class_loader::impl::getCurrentlyActiveClassLoader()' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:206: undefined reference to `class_loader::impl::AbstractMetaObjectBase::addOwningClassLoader(class_loader::ClassLoader*)' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:207: undefined reference to `class_loader::impl::getCurrentlyLoadingLibraryName[abi:cxx11]()' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:207: undefined reference to `class_loader::impl::AbstractMetaObjectBase::setAssociatedLibraryPath(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:211: undefined reference to `class_loader::impl::getPluginBaseToFactoryMapMapMutex()' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:136: undefined reference to `class_loader::impl::getFactoryMapForBaseClass(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:225: undefined reference to `class_loader::impl::getPluginBaseToFactoryMapMapMutex()' /opt/ros/melodic/include/class_loader/class_loader_core.hpp:200: undefined reference to `class_loader::impl::hasANonPurePluginLibraryBeenOpened(bool)' CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o: In function `void class_loader::impl::registerPlugin<aeplanner::AEPlannerNodelet, nodelet::Nodelet>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': /opt/ros/melodic/include/class_loader/meta_object.hpp:153: undefined reference to `class_loader::impl::AbstractMetaObjectBase::~AbstractMetaObjectBase()' CMakeFiles/aeplanner.dir/src/aeplanner_nodelet.cpp.o:(.data.rel.ro._ZTIN9aeplanner16AEPlannerNodeletE[_ZTIN9aeplanner16AEPlannerNodeletE]+0x10): undefined reference to `typeinfo for nodelet::Nodelet' collect2: error: ld returned 1 exit status make[2]: *** [/home/naazare/ros/devel/.private/aeplanner/lib/libaeplanner.so] Error 1 make[1]: *** [CMakeFiles/aeplanner.dir/all] Error 2 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2

[mseln]

Thank you!

I will have a look at the pull request as soon as I have time.