Improvements I made after submitting

I made a whole lot of fixes and improvements after submitting to Trijam. These include:

• Fix the bug that made teleportation 20 times more dangerous than it was supposed to.
• Add variety to the speed of sabots. Some are extremely slow and others quite fast now.
• Improve the sabot texture. Previously it was just a downscaled and rotated cutout from a photo from the internet. Now it is more pixel-art like.
• Add a level display to show what level you are on.
• Add some sound effects.
• Disable unsafe moves (as in disallow players from intentionally stepping into a sabot or fire by any means other than teleportation or being caught). Previously they were the source of annoying and unexpected deaths for players.