Created type map for subdecisions.
Added SubDecision model types.
Moved abbreviation and name of organ to foundation
Moved function into installation and discharge.
Moved member to relevant subdecision types.
Added budget specific fields.
Removed references to decision and subdecision.

Probably will be re-added as specific reference. For example, from
installation to foundation subdecision.
Moved content to 'other' subdecision type.
Added base implementation of 'getContent()'
Added reference to organ foundation.
Added reference to created organs.
Updated budget creation.