Ros2 install paths

[mlautman]

Addresses the issue raised here: #289

This does 3 main things:

1. It calls ament_package() at the end of the CMakeLists.txt to make it so that the ros2 package index can find plotjuggler
2. It moves the built executables into lib/plotjuggler/ instead of bin so that ros2 run can find them.
3. It also moves the libraries into the executable folder ($CATKIN_WS/install/plotjuggler/lib/plotjuggler/) so that they can be found by PlotJuggler. Ideally, they would be in the standard library location ($CATKIN_WS/install/plotjuggler/lib/) but then they cannot be found by PlotJuggler because it only looks in its current directory and in a system install dir.

tree $CATKIN_WS/install/plotjuggler should now produce the (mostly) standard directory structure:

plotjuggler/
├── lib
│   └── plotjuggler
│       ├── libDataLoadCSV.so
│       ├── libDataLoadROS2.so
│       ├── libDataLoadULog.so
│       ├── libDataStreamROS2.so
│       ├── libDataStreamSample.so
│       └── PlotJuggler
└── share
    ├── ament_index
    │   └── resource_index
    │       ├── package_run_dependencies
    │       │   └── plotjuggler
    │       ├── packages
    │       │   └── plotjuggler
    │       └── parent_prefix_path
    │           └── plotjuggler
    ├── applications
    │   └── PlotJuggler.desktop
    ├── colcon-core
    │   └── packages
    │       └── plotjuggler
    ├── icons
    │   └── plotjuggler.svg
    └── plotjuggler
        ├── cmake
        │   ├── plotjugglerConfig.cmake
        │   └── plotjugglerConfig-version.cmake
        ├── environment
        │   ├── ament_prefix_path.dsv
        │   ├── ament_prefix_path.sh
        │   ├── path.dsv
        │   └── path.sh
        ├── hook
        │   ├── cmake_prefix_path.dsv
        │   ├── cmake_prefix_path.ps1
        │   └── cmake_prefix_path.sh
        ├── local_setup.bash
        ├── local_setup.dsv
        ├── local_setup.sh
        ├── local_setup.zsh
        ├── package.bash
        ├── package.dsv
        ├── package.ps1
        ├── package.sh
        ├── package.xml
        └── package.zsh

[mlautman]

@facontidavide

[mlautman]

edit: added a fix for #291

[facontidavide]

hi @mlautman

first of all, thanks a LOT

the ros2 branch is obsolete, you should merge againg master, not ros2

[facontidavide]

merged individual changes. thanks for contributing