Created ability to alter height for tiles; cleaned up rendering code.
Water flows as simple as that.
Removed some unneeded tests.
Move around with arrow keys, cannot be bothered to check for running over.
Modified the map render to only draw ground mix when it would be visible.  And only the part of it that would be.
Highlight and other modifications.
Created a new coordinate system for the tiles, which is more robust and easier to calculate.
Now I can finally visualise my map!
Fixed neighbour finding algorithm to use the given pos, and not just the current one.
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