Add initial version of ZLib module
Detail: This is a clone of RISCOS Ltd's ZLib module, produced by reading the documentation available on their website At the moment the module is still in development, but once finished it should be functionaly equivalent to their module from the users perspective In reality the module is based around a newer version of zlib (1.2.5 + tweaks) than the version RISCOS Ltd are believed to be using (1.1.4 + double-free fix) Admin: Compiles but entirely untested. Error messages need sorting out, and there are plenty of TODO's in the sources which will need sorting before the module can be put to use. Version 0.01. Tagged as 'ZLib-0_01'
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