allocate persistent memory for structs

[maul-esel]

Memory allocated for structs returned to the user should be allocated in a way that it's persistent after the method returns.

To do so, allocate the memory using the "Heap functions" (CCFramework.AllocateMemory()). Also add a new method to structs: GetOriginalPointer(), which, if the instance was created by FromStructPtr(), returns the pointer it was created from (which only makes sense if it's still valid).

The user is responsible for releasing the memory (add a ReleaseOriginalPointer() method). In case of the TypeInfo structs, this allows struct instances to be passed to those Release*() methods, e.g. ITypeInfo::ReleaseFuncDesc().

Summary:

• Add:
  • StructBase.GetOriginalPointer()
  • StructBase.ReleaseOriginalPointer()
• Modify:
  • Struct classes & StructBase: FromStructPtr() to store the pointer
  • COM methods: allocate memory with CCFramework.AllocateMemory(), not VarSetCapacity().
• Check:
  • How far this affects nested structures...

[maul-esel]

• add a own param to FromStructPtr() which tells the struct if it may release the pointer or not (defaults to true).
• modify type information classes to set the above to false
• same for all other structures allocated by a method (unless documented otherwise)
• change nested struct creations to use false, too