Enable the use of handcalcs.render() beyond Jupyter

[connorferster]

It would perhaps be useful to create the functionality of render outside of Jupyter in the form of a function decorator:

from handcalcs import handrender # or something

@handrender
def my_calcs(a, b, c, ...):
    d = a+ b
    f = d**c + a*b
    return locals()

The decorator would inspect the source of my_calcs() and pass the source and returned locals dict to the handcalcs.latex() function and would return a tuple of the rendered Latex code, as a str, along with the last calculated variable of the function (i.e. the "result" value), which would be the last entry to the dictionary.

This would allow the rendered Latex code to be used in any other python application that can render Latex in the browser or otherwise (e.g. Streamlit)

[connorferster]

This feature has been added to Master.