This commit adds the `crossSeamAngle` and `crotchSeamAngle` options
that control how the crotch- and cross seam reach the fork.
You can get the same result as what happened prior to this commit
by setting both options to zero.
However, their defaults are not zero, so this commit changes the
out-of-the-box pattern.
I worked with Deb on this to try and come up with a trouser block
that would be a good unisex base for all sort of patterns.
We started off with what Deb had been using to draft her own blocks
and ended up with something that worked for her, and only for her.
There were a lot of vague instructions in the draft, and a lot of
forks in the code where if this do that, if not do something
completely different.
The end result was a pattern that was very brittle, and also did
absolutely not work for a variety of sizes.
So, I basically just started over, threw all of that complicated
stuff out and this is not a more simple and streamlined block
that works for different models. It even passes the ant-man test :)
Now the question is, will it fit? That will be the next step.
