Mass Blueprint integration

[Megafunk]

So far pretty much nothing in Mass is exposed to BP except for Mass Agents/actor pooling. It's definitely primarily intended to be used by C++ programmers but I don't see why it can't be exposed to BP to an extent. Full on BP ticking would kind of defeat the purpose so it would likely be limited to event-ish gameplay code.

• [x] Spawning arbitrary entities from Entity Configs
• [x] Basic core fragment changes (transform, force etc)

For the future...

• [x] BP-able processors (maybe just observers for perf reasons?)

  • [x] Query config
    • [ ] Multiple queries
  • [x] Processor/phase setup
  • [ ] Deferred actions

• [x] Arbitrary fragments get/set

  • [ ] Shared fragments

• [ ] Arbitrary tags get/set

Perhaps some more random extra module-specific functionality if it ever seems useful.

[Megafunk]

Processor/phase setup already exposed (thankfully)

[Megafunk]

BP observers and some messy but usable fragment getting is in!

[Megafunk]

Instanced struct support is in 5.1!!!!!!!!!! Weeeee!!