Add IMeshBufffer::clone for buffer copies, use it in CMeshManipulator::createMeshCopy

CMeshManipulator::createMeshCopy creates new meshes which have copies of the actual meshbuffers instead of copying everything into SMeshBuffers (which didn't support 32 bit or any of the other special features).



git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6335 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

@@ -1,5 +1,6 @@
 --------------------------
 Changes in 1.9 (not yet released)
+- Add IMeshBufffer::clone function to create buffer copies. CMeshManipulator::createMeshCopy uses that now and works now with all types of meshbuffers.
 - obj writer can now write 32 bit buffers
 - obj meshloader can now load 32 bit buffers when setPreferredIndexType is set to EIT_32BIT.
   It's 16 bit meshes use now also an IDynamicMeshbuffer instead of an SMeshBuffer.