modularise

[olliestanley]

As the scope of the project is large and inevitably most servers won't want to use a lot of the features, I want to split it up into modules (which will be separate plugins):

• politics-core
• politics-war
• politics-tax
• more???

All modules will depend on politics-core. This should also be a helpful way of testing how easy it is to write add-on plugins on top of the core.

[olliestanley]

Further progress in b25519e

[olliestanley]

The three initial modules are now separated. Still some cleanup to do:

• [x] Remove tax-specific methods from PoliticsEconomy
• [x] Remove GroupSettaxCommand and move to politics-tax
• [x] Move configuration settings to their appropriate modules

see 48ea5c0

[olliestanley]

Final step for now is to add to WorldConfig in core a way of loading settings which aren't used by core