feature: Event Conditional "In Combat" 

### Description

Allow an event to check if you are in combat by being part of a conditional branch.

### Intended Use-Case

Allows the use of event based items or spells to check if you are in combat.  Can be expanded to allow an NPC to not talk to you if it's "un safe".

### Duplicate Check

- [X] This feature request is not a duplicate to the best of my knowledge.