* jme-core: IndexBuffer fixes & API improvements
As discussed in:
https://hub.jmonkeyengine.org/t/indexbuffer-suggestions-improvements-consistency/42022/4
* [Fix] createIndexBuffer(int, int): return IndexByteBuffer as well for
vertexCount < 128
* [Enhancement] Make put(int i, int value) fluid interface
* [Enhancement] Add relative put(int i) to allow easier chaining (parity
with other buffer implementations)
* [Enhancement] Add getFormat() to allow setting an IndexBuffer to a
Mesh directly without type inspection.
* [Fix] Fix WrappedIndexBuffer
API changes make it possible that IndexByteBuffer is now a valid type
for outBuf, leverage the new getFormat() method to set the buffer to the
mesh regardless of its type.
* Update VirtualIndexBuffer to @72f8019566fa4d1379caa820c0c9dc000f489444
0ffc612bfb