Changes:
- Cannon upgrade is now more expensive and appears less often.
- Rocket/merchant upgrades are now on fixed location (600L: rockets, 760L: merchants).
- Fixed an error that would upgrade cannons when buying rocket/merchant upgrade in dock.
- Fixed power upgrade appearing in dock.
- Fixed an error when player killed itself.
- Fixed derp emoji not working on discord.
- Fixed respawn speed bonus not working.
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