Support for Paragon Monsters / HP Thresholds

[valentine195]

Would it be possible to add support for something like the Angry GM paragon monsters? I use this system quite a bit to make some boss battles more interesting, and currently I just make multiple custom monsters and switch them manually during the fight, but this feature would be wonderful to have instead. Even if it's as simple as still building two monster stat blocks, but the app handled the switch at a predefined HP level.