Converted editable map samples to data sources, merged spatialite and ogr sample, optimizations, fixes
Remove old editable vector map activity, use generalized spatiallite example (with OGR support) instead
Rename Editable activity class name for consistency
Merge OGR and Spatialite samples, unify/improve normal and editable VectorFileMap samples
Make label create methods abstract in data sources, clean up samples
Clean up imports, remove deprecated calls