Small Fix — Slime Evolution Steam update #1409918

Thanks to a review, I realized that I accidentally uploaded a version I used to test which allowed quick progression. I also changed a few other things. The following has been changed: Player no longer spawns with the Ice Spike weapon. - No weapon should have been equipped to start. Instead player should collect resources, which determines their initial weapon & progression path. Experience needed to level-up has been doubled. - It was set lower for testing purposes and never reverted to the previous setting. Knights now spawn slowly, but are a bit stronger. Upon further leveling they will grow stronger and spawn quicker. Knights now spawn at level 70, instead of 50. This should allow for further upgrades to the mob drop weapons.