[B] Allow permission-message to support chat formatting. Fixes BUKKIT-4857

The Issue:
In a plugin.yml the "permission-message" option does not support colour codes and chat formatting.

Justification for this PR:
Paragraphs providing justification for the PR

PR Breakdown:
Colourizing the permission-message

Testing Results and Materials:
As i am new to Maven this code has not been tested, so it may not provide the right results.

JIRA Ticket:

BUKKIT-4857 - https://bukkit.atlassian.net/browse/BUKKIT-4857