Encumbrance (Apocalypse)

Tentatively (needs more testing):

• Encumbrance allowance (A): 4 x Strength
• Encumbrance (E) is calculated as a weighted sum: the listed weight is multipled by the number of squares of the item. I'm not sure how items in the hand work yet, tentatively assuming same as elsewhere. Contrary to appearances, each armor unit only has one square.

The scaling factor for actual speed is then the square root of (A-E)/A. Multiply this by maximum speed, then truncate.