This update adds the long-awaited new material inventory system!

• Each type of material is combined into stacks with no upper bound
• Clicking on a material in the inventory tab assigns it to the current selected material slot in the HUD
• While in the inventory tab, you can click on the material slots on the HUD to select different ones - let me know any suggestions about other controls that would be handy
• The new inventory tab also allows filtering by solid/liquid/gas or any combination, and sorting by alphabetical, +/- count, and +/- weight

Added in Dec-07b:

• Weight indicator on the HUD to tell you what your weight is at any given time
• Encumbrance indicator on the HUD if you go above 5000 lbs.
• When overencumbered, you go to 1/10th acceleration, so there is some incentive to take heavy materials back to the spaceship or place them somewhere

Also added: when you go to the edge of space, there is no air :D

Let me know what you think! I will be adding more updates to this tomorrow!!!