Add class documentation to OSInfo
Rename OSInfo to Process

The class OSInfo only contains functionality to kill processes.  Change its
name here to reflect that it deals with processes.
Rename OSInfo to Process

The class OSInfo only contains functionality to kill processes.  Change its
name here to reflect that it deals with processes.
Revamp execute event

This change centralizes process handling into the Process class by giving
the execute event an overhaul.

Testing done:

Ran a script with an execute event.