XAML-Math 1.0

[ForNeVeR]

I'd like to finally release version 1.0 of this library, and follow semver mor strictly since then.

Before that, we should stabilize the API at least a little bit.

Depends on:

• [x] #238
• [x] #298
• [x] #340
• [x] #360
• [x] add a basic release CI test
• [x] #341
• [x] #335
• [x] #338
  • not yet, unfortunately.
• [x] #358
• [x] #359

After the release, make sure to seek for TODO[#343] in the code and fix them all.