Code refactoring.

Users should not notice any differences for this release - the changes are for code refactoring and maintenance.

Maintenance release

• Update method for calculating pressure on touch screen
• Update 'Normalize' method so client knows when there are changes to be saved
• Add support for Wemos D1 R32 board (as "ESP32 Dev Module")
• Library dependencies

Added a 'README', some minor code cleanup.

This is a minor maintenance release. It adds a README, and some minor code cleanup.

First Release

First release of a re-write of the graphics and touchscreen driver for the Waveshare 4" TFT touchscreen, Waveshare SKU 13587.

This code is based on the 'Waveshare_ILI9486' library, but with many improvements and additional functionality.