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Autogen: Add Keywords class for frequently used keyword strings

Sebastian Holtermann requested to merge sebholt/cmake:autogen_keywords_class into master

This adds the cmQtAutoGenGlobalInitializer::Keywords class. It holds various preallocated std::string instances for keywords that are frequently used in QtAutogen. The lifetime of the Keywords class instance is bound to the lifetime of the cmQtAutoGenGlobalInitializer instances which guarantees that the strings are only allocated in the context where they are needed. This is in contrast to global static const std::string instances that persist the whole runtime of the program, even when they are not used.

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