Slime Origin

Beta release to hopefully get feed back on balance changes.

• Added mod menu icon
• Due to popular demand, increased jump height from 1.5 blocks to 2 (really not sure about this one, but we'll see)
• Added "Melting" downside, causes fire damage when in biomes with a [temperature](https://minecraft.gamepedia.com/Biome#Temperature) value above one.
• Also added a "slimeorigin:temperature" condition for any data pack developers. Compares a chosen value to a float of the temperature at the players current location.
• Added a downside to "Improved Jump", player movement speed is decreased by 25%. (This number is going to need a lot of tweaking).
• Known Issue: FOV is affected by the movement speed attribute, so is greatly reduced when using the origin, a current fix is to turn down FOV Effects in accessibility settings.

I know this update is pretty heavy on nerfs, but to be fair the origin was kind of busted at launch; and don't worry, there's a pretty major upgrade coming soon.