[Allomancy] Groundwork for iron and steel wall penetration

[Gerbagel]

Changes proposed in this pull request:

• Threaded block scanning for performance reasons (would have a minor stutter every 15 ticks otherwise, small but noticeable)
• Block penetration resistance calculations
• Less line clutter (which also leads to better performance, more than is lost by the previous point)
• Pushing and pulling through blocks with resistances accounted for

For the future

• Consider resistance in push/pull strength
• Consider resistance in drawing of lines

[leafreynolds]

This is really cool 👀 will take a look through it all soon!

[Gerbagel]

Commits summary

• Fixed thread/start stop issue, meaning I fixed the modes so the thread stops when the mode is <= 0. There were also more issues with how the thread started and stopped, fixed those too.
• Reduced lines thread frequency and also added the suggested offset. I see no difference in-game, but it might work slightly better. You'll have to judge for yourself.
• Fixed the profiler issue. It doesn't crash anymore when pressing shift + f3, but I also can't see profiler info in there, so I'm not sure it's working, but I hope it is. Negligible performance impact would be cool.