Mr. Mine v0.22 - New Scientists and Cave Tutorial

Hey everyone!

We've got another update for you all! This update primarily revolves around some balance issues that were introduced with the introduction of caves and tries to address some of the feedback we've been hearing lately.

• Added tutorial arrows for caves.
• Added grayed out lock buttons when manager is not yet unlocked.
• Added 5 new scientists to the game!
• Fixed drones not using health packs.
• Fixed an issue where the fuel from health packs was based on your drones health and not fuel.
• Reduced the cost of drone level 2 to make it a more realistic purchase.
• Caves now collapse if all rewards have been collected.
• Reduced the chance of getting multiple timelapse excavations if one of your scientists already has one.
• Increased early chest spawning and slightly adjusted the rate chest spawns increase as you get further into the game.
• Replaced Copper, Silver, and Gold excavations from scientists with mineral piles which now grant higher value minerals based on where you are at in the game.