Combat hazards

[krbz999]

Proposed ideas for features that encompass a hazard on the map:

• Creating a wall; an area that blocks line of sight in and out. (Unsure how to implement, might need regions or templates or WallDocuments).
• Difficult terrain. An area that reduces movement speed. (Possibly created via MeasuredTemplates which a hook or socket turn into a Region.)
• Damage-over-time areas. A scene region that causes damage when moving through it.
• Towers. A structure at a point that deals damage to creatures every round within a certain radius. (Auras?)