V1.13 - Cave and performance update released

Today I released V1.13 (cave- and performance-update).

Change log:
changes:
- cave system
- terrain system

new features
- loading bar
- screenshots are captured, if an message is written into the log file

bug fixes:
- naked mole rats fell through world, which caused performance issues
- improved performance (to many minor changes with a big effect to list all changes)
- camera looked to the wrong location during crafting glowing tinder at the bamboo fire saw
- exceptions during crafting torches
- input fields in the building menu are set to decimal numbers only