Michael Lang authored Nov 19, 2023 and Han Young committed Nov 19, 2023

Replaces knumber with libqalculate and brings the following key benefits:
- New functions
- Displays fraction format for approximate numbers
- Unit conversion is available within calculations
- Reduced code to maintain
- Fault-tolerant parsing of strings and brings back implicit multiply
- And much much more [qalculate.github.io/](https://github.com/Qalculate/libqalculate)

Closes #12 

![kalk-functions1](/uploads/6474dfe578b75642b6cf3ca179d91ef9/kalk-functions1.png)
![kalk-functions2](/uploads/374eaeace6e500fb2100d42b3ce8ea0e/kalk-functions2.png)
![kalk-functions3](/uploads/1f3178e900771dbc185d8a4fcf88167e/kalk-functions3.png)
![kalk-functions4](/uploads/fb1e5798f29254655a70875226270db9/kalk-functions4.png)
![kalk-functions5](/uploads/b958b741aa33571db3ccd44d06c472eb/kalk-functions5.png)
![kalk-functions6](/uploads/f86d4fc9f2d76209a3d8e96de7bb0b7a/kalk-functions6.png)