Docker support for C++ target

[lhstrh]

No description provided.

[lhstrh]

@oowekyala are you interested in pulling together the same ability for Rust?

[cmnrd]

This looks like a good start, but unfortunately, this does not work on my machine. I get:

WARN[0000] a network with name lf exists but was not created for project "helloworldcontainerized".
Set `external: true` to use an existing network
[+] Running 1/0
 ✔ Container HelloWorldContainerized  Created                                                                                                                                                                       0.0s
Attaching to HelloWorldContainerized
HelloWorldContainerized  | Error loading shared library libreactor-cpp-default.so.1: No such file or directory (needed by ./bin/HelloWorldContainerized)
HelloWorldContainerized  | Error loading shared library libexecinfo.so.1: No such file or directory (needed by ./bin/HelloWorldContainerized)
HelloWorldContainerized  | Error loading shared library libstdc++.so.6: No such file or directory (needed by ./bin/HelloWorldContainerized)
HelloWorldContainerized  | Error loading shared library libgcc_s.so.1: No such file or directory (needed by ./bin/HelloWorldContainerized)
HelloWorldContainerized  | Error relocating ./bin/HelloWorldContainerized: _ZN7reactor14ReactorElementC2ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEENS0_4TypeEPNS_7ReactorE: symbol not found
HelloWorldContainerized  | Error relocating ./bin/HelloWorldContainerized: _ZSt9use_facetISt5ctypeIcEERKT_RKSt6locale: symbol not found
HelloWorldContainerized  | Error relocating ./bin/HelloWorldContainerized: __cxa_free_exception: symbol not found
HelloWorldContainerized  | Error relocating ./bin/HelloWorldContainerized: __cxa_begin_catch: symbol not found
HelloWorldContainerized  | Error relocating ./bin/HelloWorldContainerized: _ZNKSt9basic_iosIcSt11char_traitsIcEE4failEv: symbol not found
...

[cmnrd]

I pushed a quite significant overhaul. Most importantly, the docker generators are now inner classes of the platform-specific generators (CppStandalonGenerator and CppRos2Generator).

Docker generation for ROS2 works now, too. This is particularly useful as it allows building and running ROS nodes without a ROS installation.

[lhstrh]

@cmnrd, this looks very nice!!