Fix damage values

[Allofich]

Here are some fixes to damage values from the player's weapon hits.

It turns out there were a number of inaccurate things in the information Daggerfall gives about damage values, which were throwing me off until I figured them out. One is that the diagonal slash down to the right is actually a weaker attack than the horizontal attacks. The other diagonal attack is stronger, and the manual groups them together as both being stronger.

Another was that the strength damage modifier is different from what classic shows in the character sheet. It's actually (STR - 50) / 5, roughly twice the value that classic shows, in either negative or positive direction.

And then another was that the damage display for weapons with material modifiers (those other than steel and silver) is also incorrect! The material modifier to damage is half of what is shown, in both positive and negative direction.

This is backed up by a whole lot of testing and I'm pretty sure about these.

[Interkarma]

I appreciate all your work on this, thank you :)

[Allofich]

No problem. It's interesting finding this stuff that doesn't work as described.

Edit: Wrote a longish post about stuff I found that didn't work as expected. I'll note them in the source as I submit PRs.