77 improve tree library

[pa-senger]

• Added lots of tree species in tree_ref/raw_tree

• Meshed them in LOD 0,1,2,3

• Multiple genus can use a same mesh. See std::vectors in Tree class (update them as needed)

• Changed Query class into a function

• Overpass queries are now run using the perform_query function instead of a Config object

• Changed config.json file to use a bbox like Overpass

• Removed KNN for now

• Program now uses the mean of height per genus if available when height per tree is missing

• Added default height and default genus in config.json

• Code clean up and comments

• Added wrap executable to wrap new ref tree at anytime (rerun cmake)

• Updated readme and report accordingly

• Exported some basic metrics to a text file in output folder for complexity analysis

• closes Improve tree library #77