Smooth playing area of random terrain

[FlorisVideler]

Priority: [ 1 ]
Time estimation: [ 16 ]

Description:
As a user i want to smooth out the playable terrain, this because else you can't see the rest of the terrain.

Definition of Done:
The playing area is flat and there is a slope surrounding it.

Tasks:

• Figure out what way works best? (filter, manual or something else) #171
• Apply this method so terrain is smooth #172