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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.

Sprites (images) can now be created in RAM, written to with text and
graphics and rendered to screen quickly, this makes it easier to get
flicker frre screen updates.
ESP8266 can typically create up to a 160x128 sprite, and ESP32 about
200x200 pixels. 16 bit colour only at the moment, may soon implement 8
bit colour to reduce RAM.

In case of a non- supported BMP, the _tft->setRotation() should not be executed.

This avoids a processor crash it setTouch() not called in setup()

Adde Setup11... for testing with ESP32

This one does not need SPIFFS, cal data is embedded in sketch by user.

One less thing to edit or forget!

Touch reliability improved by using pressure and double sampling. Added
Adafruit compatible Button class. Added touchscreen on/off and keypad
examples.

Identify touch controller chip select and required MISO line.

Grabbing the mutex for exclusive SPI access by the TFT library causes a
crash when OTA updates are done. Always switching the hal mutex is only
marginally slower so that is now the default.

Revert setup file and add setup 10

Add XPT2046 touch controller support

Jpeg images with non integer number of MCU pixels showed corrupted right
edge. Fix is to concatenate pixels into a contiguous block. Examples
corrected.