GLES2Dbg: use 256KB chunks for lzf compression

Data format is uint32_t totalDecompressedSize, then repeat:
uint32_t chunkDecompressedSize, chunkCompressedSize, chunk data.
If chunkCompressedSize == 0, then chunk is not compressed.

Also start fixing integer sizes on server.
On client, set endianness to match server.

Change-Id: I0d5afa16976ea6019b91c4e21d284605da7e135e
Signed-off-by: David Li <davidxli@google.com>