-Added Vector3Wrapper for the property grid type converter

-Cleaned up singleton accessor for PluginManager
-Fixed disposed race condition in BaseEntity.Dispose
-Separated game entity retrieval from main thread (prevents resource lock issues)
-Improved GetTypedInternalData<T> to filter results based on T
-Fixed entity id cleaning on CubeGridEntity creation from file
-Fixed disposed race condition in CubeGridEntity.Dispose
-Minor code cleanup in SectorObjectManager
-Added check for disposed game entities in SectorObjectManager.LoadDynamic
-Fixed SectorObjectManager.AddEntity to accept all BaseEntity-type objects
-Added auto-recovery system to ServerAssemblyWrapper to restart from server crashes
-Started on cleanup/modularity of sector entity display in tree view
Merge branch 'master' of github.com:SEModCommunity/SE-Community-Mod-API

Conflicts:
	SEServerExtender/SEServerExtender.cs
-Finished entity tree node code migration to more modular layout