Preserve endianness when duplicating bytebuffers

[riccardobl]

This currently does not fix anything in the engine, since in one way or the other the endianess was restored manually, or unimportant in jme code.

This is mostly for correctness and to avoid surprises in the future.

[riccardobl]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new utility class ByteBufferUtils with a duplicate method that duplicates a ByteBuffer while preserving its byte order. It replaces direct calls to ByteBuffer.duplicate() with this utility across several classes (including AndroidGL, EnvMapUtils, GLRenderer, BufferObject, and others) and updates buffer allocations to explicitly maintain byte order. Feedback suggests adding a defensive null check to ByteBufferUtils.duplicate to prevent potential NullPointerExceptions, and adding a null check while simplifying the duplication logic in BufferObject.setData to avoid side effects on the caller's buffer.

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