v0.17.0 - Technology Revamped

Changelog:

• Feature: Technology presented as a tree, points are gained globally
• Feature: Show time till next visitor visit
• Feature: Show credits in the main menu
• Change: Utility UI buttons now works as toggle
• Fix: Exception when saving, going back to menu, loading new game and then loading a save
• Fix: Waste ejector improperly loaded
• Fix: Drone laser shown on top of visitor
• Fix: Exception when device was placed & immediately removed