Replace pow() with multiplikation to improve speed

Move falling to builtin

Blacklisted characters are: / \

Version 0.4.3-rc0; increase PROTOCOL_VERSION due to backwards-incompatible InventoryList width field

Remove "Unknown inventory identifier" deserialization errors, because they can break forward compatibility

- Don't select blocks for drawing in every frame
- Sort meshbuffers by material before drawing

- You have 2 stacks: a with x items and b with y<x items
- Take a with your mouse and place it on b
- Whole stack a moves to b
- (y * 2 - x) items move from b to a
- (x - y) items are left to the mouse cursor

- Display message when associating a key already in use
- Fix issue for not beeing able to assign space to an action
- Cleaning up
- Make it build (by celeron55)

"aux1_descends" setting switches to the old descend control.