Commit 51306dd1

– finish the code to create the wall vertex data
– fix and make the logic dealing with the internal data representation more readable
– add more comments

This finishes up the first iteration of the wall vertex generation. It also adds new enums that were raw integer value before.
The internal data had some logical overlapping problems before, as setting putting a wall on a tiles BOTTOM position implicitly also put a tile on the TOP position of the neighbouring tile. A simple mapping to fix these problems was introduced:

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