CMake

- Removed 'args' binary, which is no longer needed.
Code Cleanup

- Removed unnecessary include.
- Removed extra whitespace.
CmdUrgency

- Removed unnecessary variable.
TW-1293, TW-1294

- TW-1293 Modifying or deleting a child task does not propagate if there are no
          siblings (thanks to darkfeline).
- TW-1294 Modifying a child task does not propagate to parent (thanks to
          darkfeline).