Move node and application implementations to header file #804
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The node and application implementations were embedded in their respective .cpp file. Under normal conditions, this is preferable in order to hide the actual implementation. But it makes testing very difficult.
Tests can now inherit from these implementations and twist them to their needs, with minimal changes to the class definition (i.e. mark a method virtual, change a member variable to protected instead of private) and hopefully no changes to the actual implementation within the .cpp file.
These commits change a large number of lines, but the actual logic changes are (hopefully) nil. Please carefully critique.
Also included is an adjustment to make the app_test tests pass, as well as share some code with the cli_test application (moved some common code to a header file).