Properly name SceneryQuad vertex members
Make 3d viewer speed adjust based on current zoom
Add victims list to Entity

+ Add EntityInt16Property
+ Add EntityInt16PropertyLoader
Remodel the EntityProperty system in preparation for draw list support
Implement EntityProperty sparse and metavalue flags

+ Reorder some EntityBasicProperty properties
+ Make EntityProperty.MetaValue nullable
+ Add a missing metavalue check for loading EntityID? fields
+ Fix metavalue saving
Fix a field type comparison in EntityBasicProperty
Add "Duplicate Entity" option