Ticketing remaining issues from #1936:

• Drop the weak coupling of plugins over service name + registration
  -> libosrm interface should be typed like node-osrm
• Rename external_memory_node.hpp
• FIXME xor_fast_has_shorage.hpp only has space for 2^16 nodes
• Remove SearchEngineData, fold into SearchEngine
• Drop gpx support
• rename OSRM class -> Engine
• remove xml renderer
• remove typedefs.hpp -> No global NodeIDs and EdgeIDs !!!
• replace SimpleLogger with RTD_LOG
• Move debug_geometry to extractor
• routing_algorithms -> routing
• use sort_unique_resite or remove
• move matching_debug_info to engine/map_matching
• hash implementation in processing_chain should use util/std_hash
• replace DistTableWrapper with more generic implementation (2d vector wrapper or something)
• move TarjanSCC from extractor to util
• Remove DescriptorTable
• Rename FixedPointCoordinate -> Coordinate
• extraction_helper_functions does not follow style guide, should be cpp file
• lua_function_exists needs to be renamed
• NodeBasedDynamicGraphFromEdges needs to be renamed
• read_file_lower_content needs to be renamed
• abstract routed_options and fold into tools/routed.cpp
• rename geometry_string test to polyline
• move duration_parsing to extractor
• remove the config file option for osrm-extract and osrm-prepare
• change extractor class name to Extractor