Added initial support for wrapping osg::Array in a way that can be used via scripting.
Added full range of Array subclasses to wrappers
Added inital cut of PrimitiveSetSet wrappers to scripting
Fixed handling of enums in Lua plugin.

Fixed computation of getNumPrimitives() so that it returns 0 when PrimitiveSet is zero.

Added missing properties to PrimitiveSet serializers