Formula

What's Changed
* Support functions: `sign()`, `abs()`. Add Number class (python wrapper to use Formula solver as container for values). +validation bugfix (expressions with `>` symbols) by hozblok in https://github.com/hozblok/formula/pull/12


**Full Changelog**: https://github.com/hozblok/formula/compare/v4.0.2...v4.0.3

What's Changed
* Fix `formula.variables()` for expressions with complex numbers by hozblok in https://github.com/hozblok/formula/pull/11


**Full Changelog**: https://github.com/hozblok/formula/compare/v4.0.1...v4.0.2

What's Changed
* Update GitHub actions, Readme.md by hozblok in https://github.com/hozblok/formula/pull/9
* Add complex numbers support by hozblok in https://github.com/hozblok/formula/pull/10


**Full Changelog**: https://github.com/hozblok/formula/compare/v3.0.0...v4.0.0

What's Changed
* Support python 3.10, 3.11 by hozblok in https://github.com/hozblok/formula/pull/6
* REFACTORING: rename `boost_win_headers` & `boost_lin_headers` -> `boost_headers` by hozblok in https://github.com/hozblok/formula/pull/7
* REFACTORING: Add `update_command.py` script and update boost headers to the `1.79.0` version by hozblok in https://github.com/hozblok/formula/pull/8

**Full Changelog**: https://github.com/hozblok/formula/compare/v2.0.1...v2.1.0

Small fixes

Get rid of Python 2.7
Get rid of Python 3.5
Update docs and remove some unwanted code