**Added:**

* New ``xonsh.procs`` subpackage for handling subprocess mode.

**Changed:**

* <news item>

**Deprecated:**

* <news item>

**Removed:**

* The deprecated ``foreground`` decorator has been removed.
  Please use ``unthreadable`` instead.
* ``xonsh.proc.unthreadable`` and ``xonsh.proc.uncapturable``
  have been moved to ``xonsh.tools``. Please import from
  this module instead.

**Fixed:**

* <news item>

**Security:**

* <news item>