Added ICarbideBuildConfigutation#getCompileTimeMacros() and EpocEngineHelper#getGlobalDefinesForConfiguration()
as convenience wrappers for getting macros contributing to a carbide project. Removed ICarbideBuildConfiguration#hasSTDCPPSupport().
Refactored CarbideLanguageData to use simplified macro retrieval
<?xml version="1.0" encoding="UTF-8"?>
<?NLS TYPE="org.eclipse.help.toc"?>
<toc label="C Predefined Symbols" href="html/symbols/symbols.htm">
<topic label="ANSI Predefined Symbols" href="html/symbols/sym_ansi.htm" />
<topic label="Carbide Predefined Symbols" href="html/symbols/sym_carbide.htm" />
<topic label="Checking Option Settings" href="html/symbols/sym_settings.htm" />
</toc>