Multiple input layers

[ergor]

Add support for additional data:

• Roads/streets
• Landscapes: forests, beaches, etc
• Lakes

[ergor]

Possible data set for forests:
https://kartkatalog.geonorge.no/metadata/sat-skog/ee232937-578e-4e4b-b35c-c50c0473fc25

[ergor]

Roads:
Vbase: https://kartkatalog.geonorge.no/metadata/vbase/96104f20-15f6-460e-a907-501a65e2f9ce
Elveg: road data with metadata useful for route planning, traffic, etc: https://kartkatalog.geonorge.no/metadata/elveg/ed1e6798-b3cf-48be-aee1-c0d3531da01a

Topographic:
N50: https://kartkatalog.geonorge.no/metadata/n50-kartdata/ea192681-d039-42ec-b1bc-f3ce04c189ac