Finish work on attaching and user canceling.

  - [x] Modify config for stdin by adding attach api call
    - [x] Add `Attach` method
    - [x] Complete `Attach` so that it reads from the stream
    - [x] channel the console output => still waits on exit, for now
    - [x] wait on container channel => WaitGroup
  - [x] Fix interfact wrapping in logging messages => temporary fix with
        v[0] (index 0), and only for console logging
  - [x] control-c watch => use channel and signal notify
  - [x] Add file mode command line option for building/launching `-f`, however
        don't code for it, only the flag