Refactor routing plugins:

- remove superflous members from RawRouteData, partially implements #1238
- DescriptorTable moved to BaseDescriptor.h
- added templated assignment c'tor to DescriptorConfig
- refactored check for valid input coordinates, moved to BasePlugin.h
- replaced shared_ptr's to descriptors in ViaRoutePlugin.h with unique_ptr
- implemented FindIncrementalPhantomNode in facades for a single, i.e. first result
- untangled a few includes

Library/OSRM_impl.cpp

@@ -34,6 +34,7 @@ namespace boost { namespace interprocess { class named_mutex; } }
 #include <osrm/RouteParameters.h>
 #include <osrm/ServerPaths.h>
 
+#include "../DataStructures/QueryEdge.h"
 #include "../Plugins/BasePlugin.h"
 #include "../Plugins/DistanceTablePlugin.h"
 #include "../Plugins/HelloWorldPlugin.h"