Add data watching tasks.

[RezzedUp]

Suggestion:

• Create a task that checks on OpGuard's jar for renaming/deleting.
• Watch OpGuard's config/data files.

Suggestion:

Check for renaming, deleting, and the file size. (A malicious plugin could also use "FileOutputStream" to write zero bytes ("0") to OpGuard.jar, so that the file size of OpGuard.jar is zero and the content is empty.)