TODO

* Provide a way for a profile to say "restart if this file changes"
* Maybe a control program to start and stop individual or all services, or initiate a rescan
* Tests, at least for the Util functions

* Simplfy the application loop into an explicit state machine
  * App::ProcLaunch::run does only a few things:
    1) one-time setup
    2) start a loop
    3) in the loop, maintain the hash App::ProcLaunch::_profiles
    4) in the loop, for each profile in the hash, call Profile::run()

  * App::ProcLaunch::Profile::run() keeps state in App::ProcLaunch::Profile::_status
    * if status is STOPPED, do _start_profile_if_should_start && set status to STARTING
    * if status is STARTING, check for pid_file, set status to RUNNING
    * if status is RUNNING, check that pid in pid_file actually exists and check if should restart
    * if should restart, set status to STOPPING and send SIGKILL
    * if status is STOPPING, check for pid in pid_file. if pid is gone, set status to STOPPED