Update dependencies & README
Some memory optimisations

Change-Id: I67b7e1b29750e65afc49b77754fb9db4f8834d92
Prepare for release

Change-Id: Ibd15314a45e6f7292df0cdecfe00552285df9235
Add 9.2.0 changelog

Change-Id: I100a770eb905a0a16c81969a9565ccac1008d823