v0.1.2

Added TouchInterruptPin
The ft6x06 indicates when touches are ready by manipulating an interrupt line.

By wait-polling this interrupt before reading the touch status registers we avoid spurious errors when the touchscreen controller becomes dormant (after not being touched for a while).

v0.1.1

Workaround on STM32F413:

• On the STM32F413 the touchscreen shares the reset GPIO pin w/ the LCD.
• The ST7789 driver uses a fast (10uS) reset.
• The touchscreen controller needs 5mS:
  https://www.displayfuture.com/Display/datasheet/controller/FT6206.pdf

Perform a longer reset here first.

v0.1.0

added rtt_target crate