Easymenu3

- Added `print_table` function
- Adjusted formatting.
- tidied up a bit

**Full Changelog**: https://github.com/pitterpatter22/EasyMenu3/compare/v0.3.0...v0.3.1

- Added support for submenus.
- Simplified entry point for app (`start()`) and added options to trap errors instead of using a seperate method.
- Made `print_menu()` private and made use of it display a message saying to use `start()` instead.
- Added options to catch errors when running.
- Adjusted formatting.

**Full Changelog**: https://github.com/pitterpatter22/EasyMenu3/compare/0.2.3...v0.3.0

Initial release considered stable


**Full Changelog**: https://github.com/pitterpatter22/EasyMenu3/commits/0.2.3