Restructure Package hierachy

[bevans2000]

Is your feature request related to a problem? Please describe.
The source code has grown over time and the existing package structure results in hotspot of large packages.
Secondly there are cases where the separation of concerns is poor giving a high dependency.

Describe the rationale
Split the packages into a more structured approach with more top-level packages.

Describe the goal(s) you have in mind
Key changes would be:

• structure renamed to settlement
• structure/building moved to new top level package
• structure/construction moved to new top level package
• person/ai/task moved to new top level package

The Tasks classes will be moved out of the general single location into task sub-packages under the appropriate top level; this is being covered as part of #1285.

This would be a large change but relatively low risk if done in an IDE. It's important files undergo a Git rename to preserve the history.

[mokun]

Can we also consider the possibility of having remote stations, such as weather tower, communication towers, traffic hub, etc. that will be minimally manned and/or robotically operated ?

[bevans2000]

Ok. What's the difference between a Settlement with only one Building? I think those places would just be a small settlement