STM32F4 support, Zolen LCD and text.c bug

I added a device file and header for STM32F4xx. I tested on a Nucleo F401RE board (STM32f401RE).
I also created an initialization code for a Zolentech 128x64 COG LCD.
Corrected a bug in text.c file for reading fonts in MikroE format. bytes_high  is computed wrong if the font height is not a multiple of 8.
Updated Readme.md with the new symbols I have created: GLCD_DEVICE_STM32F4XX and GLCD_INIT_ZOLEN_12864_FFSSWE_NAA