devel/py-simpleeval: create port

simpleeval is a single-file library for easily adding evaluatable expressions
into python projects. It can allow a user to, for example, set an alarm volume,
which could depend on the time of day, alarm level, how many previous alarms had
gone off, and if there is music playing at the time.

WWW: https://github.com/danthedeckie/simpleeval

PR: 208688
Submitted by: Joseph Mingrone <jrm@ftfl.ca>