Update node definitions to handle DDA talk topics.

[kevingranade]

DDA talk topic serialization is rooted at:
https://github.com/CleverRaven/Cataclysm-DDA/blob/91cb7bbdbe1d4a16b2f03eb9033cd8a24b6b9d0b/src/npctalk.cpp#L4352-L4367

Update dialogger to read and write these node types.

Initial version can contain dialogger spam like node positions, DDA should just ignore extra members.

[kevingranade]

Dialogue definitions have moved to https://github.com/CleverRaven/Cataclysm-DDA/blob/master/src/dialogue.h