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

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#Keywords for Carbide preferences
carbcPreference.common=carbide symbian c cpp cplusplus
carbcPreference.carbidedebugger=debug debugger dynamic runtime objects support code arrays sdk view