forked from Kistler-Group/sdbus-cpp
* Add preliminary changes for async server methods * Refactor the Message concept and break it into distinctive types * Continue working on async server methods (high-level API mainly) * Continue developing support for async server * Finishing async server methods * Finishing async server methods (fixing tests & cleaning up) * A little code cleaning * Add unit tests for type traits of free functions * Support for generating async server methods in stub headers * Update ChangeLog for v0.3.0 * Update the tutorial with how to use async server-side methods * Update the TOC in sdbus-c++ tutorial * Update numbering in TOC * Remove unnecessary code * Final cleanups