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- Adds an abstract base class for profile generators, QgsAbstractProfileGenerator. This is modeled off the approach used by map layer renderers, where a QgsAbstractProfileGenerator subclass object is created in the main thread and does all required (hopefully inexpensive!) preparation steps necessary to do on the main thread. Then a separate background thread can later call the virtual generateProfile method, which does the heavy lifting of calculating the associated profile. Later the results of the profile generation can be retrieved back on the main thread. - Adds an interface "QgsAbstractProfileSource" for objects which can create a profile generator given a QgsProfileRequest. Map layer classes will implement this interface, but potentially 3rd party (plugin based) objects can also implement the interface if they also want to add custom results to the profile charts (e.g. borehole trace lines).