Styleframe

* Added option to pass a json string through cli
* Added `cells` option to `default_styles` when using JSON

* Added commandline interface that supports json to xlsx
* Added `utils.fonts`
* Added `width` and `height` arguments to relevant styling methods

* Removed support for individual style specifiers when calling styling methods

* Added 2 general styles to `utils.number_formats`: '0' as `utils.number_formats.general_integer`
and '0.00' as `utils.number_formats.general_float`
* Fixed a bug with a `DeprecationWarning` unnecessarily showing

* Added ability to change font
* Added ability to change cell border type
* Added `style_obj` argument to all styling methods which accepts a `Styler` object so styles can be reused.
The ability to directly pass style specifiers is deprecated and may break in a future version
* Added basic ability to read stylized excel into a stylized StyleFrame by pass `read_style=True` to `StyleFrame.read_excel`.
Currently does not support reading style from a subset of sheet (ie using `startrow`, `startcol` and the such)
* Added ability to provide a default `Styler` object to `StyleFrame.__init__`, and added deprecation message when not
passing a `Styler` object to styling methods

* Added ability to run tests by code:
python
from StyleFrame import tests
tests.run()