Cleanup

Rename Widgets to Pages. Streamlined unique values from individual calculators.
Fixed stress factor for Mifflin. Streamlined output string formatting and
removed some redundant parts. Removed imports that were no longer needed.
Rename Widgets

Widgets class became Pages for clarity.
Clean Up & Clarify

Renamed some local variables for clarity. Removed decimal module.
Streamlined the energy_needs function when dealing with penn state and fixed
the issue of it ignoring stress/activity factor with Mifflin.