Adding Rivers and Lakes 0-6 zoom

[johaahlf]

Please add to new files to the build script.
10m_rivers_lake_centerlines.geojson
10m_lakes.geojson

[klokan]

@jirik Could you please adjust the tippecanoe script to include these new geojson layers?

Link the commit here - so in future, somebody else can make it.

[idastorm]

@jirik and @klokan in the data folder there is now also a point layer containing the centroids (10m_lakes_label) of the lakes for label purposes. That should also be added to the script. Thanks!