Free function api (#1469)

* Initial free functions

* Mypy fixes

* Add a mypy plugin that handles _get*

* More helpers and fixes

* black

* More hooks

* More ops and primitives

* Fill with constraints and cap

* Minimal docstrings and mypy fix

* Bool op operators for Shape

* Extra docstring

* Added spline primitive

* Added alternative constructors

* Update solid

* Add shape normalization

* Add text

* Added moved overload

* Another moved overload

* Convert location constructor to multimethod

* Additional Loc constructor

* Extra vertex constructor

* Additional cone overload

* Start with tests

* Fix compouund normalization

* Bool op tests

* Additional Location overload

* test moved and fix bool ops

* Different cap params

* More tests

* Test revolve and offset

* Test sweep and loft

* Add bool ops

* More tests

* Test text

* Improve coverage for utils

* More move[d] and Location overloads

* Start working on some docs

* Update index

* Doc fix

* Typo fix

* More move/moved overloads

* Small doc update

* Better Location coverage

* Fix angle units in Location

* More docs and a usability fix

* Cosmetics

* Mypy fix

* Remove dead code

* Coverage tweaks

* More docs'

* Box centering and box/plane arg order

* Docs cosmetics - nicer sweep

* Apply suggestions

Co-authored-by: Jeremy Wright <wrightjmf@gmail.com>

* Add docstrings

* Doc tweaks

* Bump multimethod version

* Add occ_impl.shapes

* Mention free funcs in the primer

* Typos

* Typo

* Punctuation

---------

Co-authored-by: Jeremy Wright <wrightjmf@gmail.com>

setup.py

@@ -28,7 +28,7 @@ if not is_rtd and not is_appveyor and not is_azure and not is_conda:
     reqs = [
         "cadquery-ocp>=7.7.0a0,<7.8",
         "ezdxf",
-        "multimethod==1.9.1",
+        "multimethod>=1.11,<2.0",
         "nlopt",
         "nptyping==2.0.1",
         "typish",