feat: add airports

[JulesL2]

Description

Work finished
That would be good to close : #9

• Added a relation recursion option to reduce the time to process relations (download directly the first time instead of dowloading when needed)
• Improved geometries handling in the overpass processing functions -> Important time reduction for large geoms
• Improved also the hash table for closed geoms such as forests and rivers with a shuffle and consecutive segments update.
• Added forest and airports
• Improve logs

Warning

Merge after overpass speed up and railways as this PR rebase on railways

Proof of Functionality

[JulesL2]

@ThomasParistech
To "match" more a google maps view, I have added the farmland with a different shade.
It gives this result

[JulesL2]

@ThomasParistech
Don't you think that forest like this can be cool (there is also the linewith feat of PR #24 in the image)

[ThomasParistech]

@JulesL2
Indeed I agree that the left map looks better (eventhough we still need to play a bit with the colors). Especially for small runs in the countryside 👌 😃
Ideally there will be an option in the GUI to choose what we're displaying

However, I'm still not convinced by the airport and the railways :/

[ThomasParistech]

@JulesL2
If we start adding airports, we'll need to add nuclear plants, schools, swimming pools.....
I'd rather keep it minimalist
your Geneva run will already look cool without the airport ;)

[JulesL2]

For this run I like the airport :). Do you think there are improvements to make ?