option for maintained aspect ratio of calculator body.

[gltovar]

Currently the app stretches to fit the phone screen and even turning off zoom mode doesn't allow any change to the scale of the calculator. It would be nice at the bare minimum to allow an aspect ratio lock, and above and beyond if a max zoom of the whole device could be offered. Thanks! Screen shots from my moto razr's screens.

[gltovar]

These are pics that were from a prior version (1.1.3c) that were sized to expectations

[eanema]

Not sure if it was clear in the repo description but I setup this repo because I had a moment to figure out how to compile this app for arm64 so I can run it in my new phone. I really have no time to devote to this project but I still felt I should share it with whoever wanted it. If you would like a feature added (or removed in this case?) then please feel free to submit a merge request and provided the changes are reasonable, i will merge them into this repo.