Build 5: An Update to Rival Metal Gear

This description was taken from GitHub.

Too many new things to list, but I'll give a gist:

*  New sprites for full speed when running
* Tileset updates for slopes
* Platforms
* Added a few Tutorial billboards
* Secret tileset
* Ranks that actually require perfection instead of a point threshold
* Optimization in certain parts
* Detrixie changes
* "New" HUD sprite
* Unused wallrun code, for those who'd like to add it
* Miscellaneous sprite changes
* Tons of little changes

You're welcome.