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

pluginName = Carbide.c++ UI Designer Model
providerName = Nokia
carbideModel=Carbide.c++ UI Design
carbideAppModel=Carbide.c++ Application UI Design
carbide.category=Carbide.c++ UI Designer Category
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