Update 0.11.0 - Vacuum Upgrades

Your vacuums can now be upgraded! Each of the 11 vacuums has a unique stat boost that grows as you level it up to 100. Unlock upgrades through the Prestige shop, then spend money and junk to power up your collection. With milestone levels every 10 levels introducing new junk requirements, there's plenty to work toward as you progress through the game.

Additions:
* Added the vacuum upgrade system. Each vacuum has a unique stat boost - level them up using money and junk.
* New Prestige upgrade to unlock vacuum upgrades. Requires junk unlocked.
* Four new achievements for vacuum upgrade milestones.

Improvements:
* Balanced offline junk rewards: increased base offline junk efficiency and raised the maximum
* Improved the stat system to allow for more complex interactions and better performance
* Sale periods served from backend to improve reliability

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Happy Vacuuming!