Use enum, object, or strings for penmode

[docprofsky]

It would be nice to use an object (as an enum), enum, or strings for the different penmodes.
If we use an object this is applicable.
Using objects as an enum
We could also use an enum library.

@techninja what do you think?

[techninja]

Sounds neat. Maybe later.

[docprofsky]

Should I use an object, strings, or an enum library?