major refactor to wrap retieval of macros all around ISymbianBuildContext, to avoid need to access internal apis. Added getTargetTypeMacro(String targettype), List<IDefine> getMetadataMacros(), List<IDefine> getBuildMacros().

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<?eclipse version="3.0"?>

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 $Id: plugin.xml,v 1.1 2009/02/05 00:31:08 wpaul Exp $
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