2.5D Markers

[andremig-bentley]

WIP

This has not been touched in over a month so it's very out of date with master, and it was not in a place to be ready to push when the task was paused and I was moved to a different task. I had started to create a particle effect for these markers that I hadn't gotten working yet, so instead I was modifying the snow and explosion particle effects. I was starting work on parsing through a texture atlas on the gpu, and then assigning a subtexture to each instance of those particles. I hadn't yet gotten this working either, and right before this task was dropped, I learned that I was most likely going about the texture atlas parsing in the wrong way. To be blunt, most of what I have here is wrong, and I was about to scrap a lot of it and start over before I moved tasks.
@markschlosseratbentley @pmconne

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