Update: Implement "execute" support and fix bugs.

Update: Implement "execute" support and fix bugs.

Provide new feature for executing into another program.
This is provided via the new Item Action "execute".

The function controller_perform_ready() is being called and the status is being checked but the status is not being assigned.

There are a few cases where thread.enabled needs to be checked and a few cases it does not need to be checked.

Several of the threads need to be aware of the normal/other status to properly determine the thread.eneabled situation.
Without this, they make incorrect decisions that result in bugs.
I did not want to implement a new structure to resolve this so instead provide custom wrapper functions to call that set the appropriate normal/other state.

The functon controller_thread_process_cancel() now needs to be caller aware so that the caller does not get cancelled.