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Adding ability to load settings from the calling program rather than modifying the library for each project that uses it. This is mostly for PlatformIO IDE which manages the libraries differently than Adruino IDE.

width or height over 127 pixels got converted to a negative number!

Added example "Sprite_scroll"
Tidy up virtual function list
Add PROGMEM bitmap image functions

Can now specify a colour that will not be plotted so some part of the
Sprite are "transparent" and the TFT backforund shows through. New
example added for demonstration.

The 32 bit alignment offset must be checked for every line to prevent crash with odd pixel count lines.

Do not adjust x datum for characters that have a positive offset.

Prevent memory access to non-existant Sprite memory areas which would
cause a processor reset.

Do not substitute bad characters for first valid one.

Correct isuue #58

Fix width/height override issue when using setRotation

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.

int16_t  xo16 = 0, yo16 = 0;

Should have tested that last minute edit!

Minor tweaks and speed improvements

Add 8 bit colour depth.

Added setColorDepth(d) where "d" is 8 or 16.
Default is 16 bit if not specified.