Matchmaking balancing & bot improvements (v0.59.3)

[h2]Matchmaking improvements[/h2]
- Fixed an issue that caused team balancing to be bad in matchmaking
- Tuned the matchmaking search algorithm to suit our new rating system better

[h2]Bot improvements[/h2]
- Bots now challenge for the puck instead of chasing you

[h2]Arena[/h2]
- Made the goal lights prettier

[h2]Cosmetics[/h2]
- Added tribal set and purple variant of the shell
- Added carbon slinger and techno stick as part of the Patreon vote

[h2]Other[/h2]
- Added the ability to remove the password of a lobby or add one after it has been created (the lock button on the left)
- Fixed some pop-ups waiting until the end of the game when they shouldn't (like after reporting someone)

GLHF