Promoting m_static to all SceneCacheNodes
making a unified sceneParmChangedCallback
Added objectOnly toggle to SOP_SceneCacheSource.

Using it to prevent diving into the hierarchy when we really just want to evaluate the current level,
and to determine correct animated/static state.
OBJ_SceneCacheNode is always animated (temporarily).

This is safer until we get some feedback from SESI and can track down the drawing update bug properly.
Correctly transforming GR_CortexPrimitive at render time
Fixed OBJ time dependency issues.

Time dependency has a different meaning in OBJs as in SOPs. In OBJs, a node may be time dependant simply because its parent is, since that effects its world matrix. Since Houdini tries to encourage every OBJ to be static, the solution is to believe Houdini when we're told an OBJ is animated. We now only update time dependency of OBJs when Houdini thinks the node is static, but we know otherwise.
Merge pull request #75 from andrewkaufman/timeDependencyIssues

Houdini SOP Time Dependency Issues