- Node type is now set on construction and never changes
- Added army propagator that also checks for TOWN and HERO
- Renamed existing propagators to be in sync with enumeration
All pointers held by bonus itself are now const.
To support OppositeSideLimiter (the only stateful limiter) bonuses now
hold their player owner instead.
No changes in functionality or mods
- Removed 'version' field from serialize() method
- Handler classes - Binary(De)Serializer now have 'version' field
- Serialization versioning now uses named enum
Save compatibility with 1.4.X saves should be intact
