Make script to swap variant and layer, and implement in gbn

[mszell]

• write and apply swap script
• implement in gbn for future exports

For growbikenet:

This structure would be better
Spec: <city>-<tool>-<algorithm>-<layer>[-<variant>]
Example: amsterdam_nl-growbikenet-betweenness-grid-with_bikenw

Currently, it's

aachen_de-growbikenet-betweenness-from_bikenw-grid_triangle
                                  └ variant ┘ └── layer ──┘

So if you could swap the last part. that would be more consistent and easier to parse.

e.g.

aachen_de-growbikenet-betweenness-grid_triangle-from_bikenw.geojson
aachen_de-growbikenet-betweenness-grid_triangle-from_scratch.geojson
aachen_de-growbikenet-seed_points-grid_triangle-from_bikenw.geojson
aachen_de-growbikenet-existing_bike_network.geojson

Originally posted by @MoritzStefaner in #31

[mszell]

Resolved by BikeNetKit/GrowBikeNet#315