One way platforms

[thejoshwolfe]

First implemented by @Patashu in #24.

The idea is to have something that's one-way passable. Furthermore, a platform that only exists on grid lines instead of occupying an entire cell would be cool. Combing these, we get the platforms in patashu-remix-1 experimental branch.

[XeroOl]

I want to see platforms like in patashu-remix-1 for every direction

[thejoshwolfe]

You can play around with the OneWayWall* tiles in patashu-puzzle-pack-1 experimental version. There are subtle differences between those and the platforms that I programmed, but it should give you some feel for it.