Add a vertical progress bar

[hugodahl]

It would be nice to have a vertical progress bar. Some examples of use:

• Gauges
• Meters
• Goal "Thermometer" displays

[hugodahl]

This can be assigned to me since I've already started doing some work on this control as mentioned in today's (2021/02/01) weekly CircuitPython weekly meeting.

[hugodahl]

Most of these tasks, if not all, will result in a breaking change from the currently published version of the library (v1.3.5 at this time).

Tasks

• [x] Add license information to files where they are missing (pre-commit fix) (Fixed Thanks @dherrada!)
• [x] Relocate files to organize library as a package (move to ./adafruit_circuitpython_progressbar/...)
• [x] Create a base class for both horizontal and vertical layouts
• [x] Update parameters to use tuples for paired values (width/height, positioning coordinates)
• [x] Update documentation to reflect new syntax
• [x] Update examples with new syntax
• [x] Add an example for the vertically rendered control for current platforms