Images/sprites overlapping both sides of the display were not correctly
cropped.
Option added to allow RGB<>BGR colourr swap option to be used.
ESP8266 Wemos D1 R1 pin numbering difference accomodated.
TTGO T4 setup changed to use HSPI port.
This commit fixes an issue when setting screen width
and height from the constructor (e.g., user sketch),
followed by setRotation(i). Previously, setRotation
used TFT_WIDTH and TFT_HEIGHT, ignoring user overrides.