New running mod

Built on top of Reaper's stamina/running mod.
The general outline is:
You can toggle on running, at full stamina it doubles your move speed (technically halves move cost) at the cost of burning through your stamina rapidly.  The speed boost decays as your stamina drops, until it disappears entirely when your stamina reaches 0, at which point you're moving at walking speed regardless.
The stamina drain scales with your encumbrance level, so carrying a lot of stuff makes you get tired faster.
You regain stamina slowly while walking, and rapidly while inactive.
Throwing things, firing bows, and using melee weapons also drains stamina, and if your stamina is low (under 25% currently) they gain move penalties.

TODO:
- [ ] Adapt winded disease from #8888 for when your stamina becomes critically low.
- [ ] Add more actions that drain stamina.
   - [ ] Dragging vehicles
   - [ ] Smashing things
   - [ ] Riding bicycles.
- [ ] Integrate with diseases and mutations.
- [ ] Make reaching 0 stamina automatically turn off running.
- [ ] Add move mode indicator to UI.