Gerwin's Iceland 1024 tileset 0.9

This is 1024x1024 optional tileset and treemod for Gerwin's "old format" IcelandNA terrain.

New waternormal included (still experimenting with those)

Stretching the reality a bit I decided to add some clusters of trees/bushes to most of non-snow tiles -this way it's not 100% accurate but gives us something happening down low.