More configurable display + hints + compact mode

[rsnodgrass]

Description

This adds several new features to rpi_i2c_oled, notably:

1. new thin vertical hint bar that can be used instead of icon (optional)
2. compact text mode allowing slightly (optional)
3. simplified writing of multiple text lines and automatic font sizing
4. moving common actions into a default rendering call

New configuration options for:

• turn on/off icons
• turn on/off hints
• turn on compact text mode

Updated docs with new config keys plus also with several example screenshots.

Does not break existing configurations (backwards compatible).

Related Issue

#11

This PR fixes or closes issue: 11

Motivation and Context

Much improved configurability and visual aesthetic for users.

How Has This Been Tested

All config options have been tested on a RPi with a 3601 screen.

Types of changes

• 🐛 Bug fix (non-breaking change which fixes an issue)
• 🚀 New feature (non-breaking change which adds functionality)
• 🌎 Translation (addition or update a translation)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have tested the change locally.