Packet Loss is fairer and now has hints

Packet Loss is fairer and now has hints: after two tries on a level (or a minute with no upload) a Hint button appears. Tap it once for a tip, again to see where and when to use the key tool.
- Hints are free.
- Level 1-2 now says every packet needs its own float, and a dozen tight levels got more room or a spare tool.