Add ability to submit run by uploading WSplit/TST-compatible file

[rggibson]

Uploading the split file will not only auto-populate the relevant submission inputs, but the splits will also be stored in a new TextProperty. Links will be added to the runner and game pages for downloading the splits in either format.

[glacials]

I wrote parsers for the WSplit, TST, and SplitterZ formats for splits.io if you want to check out the code (it's in /lib and explained in the project readme). Feel free to steal it and pythonify it.

You can also feel free to link to splits at http://splits.io/, or to the download path for them if you want.

[rggibson]

Awesome, that's pretty cool stuff. I likely won't have time to pythonify it any time soon. I think I would prefer to link to spilts at splits.io anyways since there is no need to have splits live in two different places. However, I'm still short for time so I'm not sure when I might find time to integrate this, but I think integration is definitely the way to go.

[glacials]

Sounds good. I'll put an API on my todo list.