V2.0.9

In this release we transitioned away from := into a more heuristics based = parsing.

This way the calc script looks more like this

a = 5
b = 7
c = a + b = 12
    = 12
1 + 1
    = 2
    c = 12

which is in my opinion more intuitive to understand and better reflect how maths may be written in email or paper.

Also made this more modular and published to npm so you can integrate this to other projects.