GitLab now uses a `/-/` component between the `group/project` part of
the URL and the `{issues,merge_requests,tree}` part so that it can
support `group/subgroup/project` with arbitrary depth.
This refactors and simplifies the QtAutogen.RerunMocPlugin test.
Repetitive task are packed into macros.
By using version strings to store file timestamps, timestamp comparison
becomes more reliable. Test status and error messages are improved.
Some AUTOGEN tests require the Qt core libraries only and
some require the Qt gui libraries to function.
This replaces the AutogenTest.cmake script with two specific
AutogenCoreTest.cmake and AutogenGuiTest.cmake scripts that
are included on demand.
