1.7.2 Upgrade: Entity Base and AI 99%

The base entity code looks good and all the AI has been tweaked to work,
again, many tests will be needed, but nothing major has changed here.
Various other classes here anad there have been fixed.
All that's left to do now are each of the Creature classes which should
be fairly simple and then I need to see how the Configuration has
changed.
The last phase will be test, test, test!