Added new machine: Gas Transporter (WIP)

Not yet completed
Some changes

1. Added gasbottle class for gas transporter
2. Fixed radon all over the element table
3. Added part of the gasbottle texture
Merge branch 'airtransporter'

Conflicts:
	cyb/6.png
	cyb/cyb1.java
	cyb/item_retrdoor.java
	cyb/recipe.java