Add fire drill (survivalcraft firestarter), update changelog

The fire drill is crafted from two skewers and a string, and can be used as a way to create fire solely from wilderness-gatherable materials (assuming you have a knife, which everyone starts with anyway).

Using a firestarter is much slower than a lighter or matches, and also much more difficult, relying on your Survival skill. You have about a 50% chance to successfully light a fire at skill level 3, and a 1 in 1000 chance with zero skill.

Firestarters degrade over time, and are no longer suitable after 20 uses (feel free to change that number if you want).

Given how absurdly common matches and lighters are, I don't think that this has any game balance issues.

Also updated the changelog to include my major 0.5 changes that hadn't already been added to the changelog.