Add decgen to the misc tools
Detail: Misc/decgen/* - Add a copy of decgen (http://www.phlamethrower.co.uk/riscos/decgen.php) so that it can finally start being used for generating the Debugger disassembler. This is a stripped down copy of the 1.40 release containing just the bits we need. Admin: Required for building Debugger-1_85 Version 1.65. Tagged as 'Library-1_65'
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