BaseGameTriggerEntity supports sphere, bounding box, and poly line trigger shapes in workshop attributes. But SCR_ScenarioFrameworkPluginTrigger only supports sphere. I cannot even add shape functionality myself as BaseGameTriggerEntity only exposes methods for editing sphere radius.

1. Add methods for editing all shapes to BaseGameTriggerEntity.c
2. Support all shapes in SCR_ScenarioFrameworkPluginTrigger

(I say all shapes, but I'm really just interested in bbox)