Integrate CubMX into TFT_eSPI

[wvdakker]

This is a PR for using TFT_eSPI with the STM32CUBEIDE (including CubeMX) or Platformio with the stm32cube framework. I have tested the patch with the parallel version of a ILI9481. To activate the use of the framework a '-D CONFIG_TFT_eSPI_STM32CUBE' must be used. Omitting the option falls back to the original use of TFT_eSPI.

There is a README in the Doc/CubeMX directory which describes all steps.

For now it is working with the Parallel interface, I am working on the SPI interface which will be added in the next days. However I made a PR to get a review so I can correct all issues during the next upload.

Have any questions then ask!

/Willem