Offering OpenStreetMap support and improving Edit Mode for Marble

by Marius Valeriu Stanciu for KDE

Offering OpenStreetMap (OSM) support is crucial for the further development of Marble as it is one of the main geographical data providers out there. It would fill a gap in Marble's reliability and would certainly add one more useful tool to the "Swiss army knife". Moreover, refactoring existing code in Marble’s plugins and libraries is bound to be one essential goal, as it would greatly improve the overall code quality and robustness.