Cleaned up "extra" functions

Increased compatibility with other libraries

• Renamed constants to deconflict with other libraries
• Ported to earlphilower/arduino-pico platform
• "Extra" functions to drive SSD1306 with OneBitDisplay or AdafruitSSD1306 libraries until a SSD1306 FILE stream is ready in CowPi_stdio

Failed stdin/stdout setup will time out

Ready for Fall 2023 Semester

• Everything up through 0.5.1
• Replaced cowpi_hd44780_set_send_halfbyte_function() with direct assignment to cowpi_hd44780_send_halfbyte
• Hardware-based I2C now works in simulator

Added compile-time enabling/disabling memory-expensive display modules

Has FILE streams for USB connection to host computer and for MAX7219- and HD44780-based display modules, and Morse Code. Works with Nanos and Picos (and a few others). Ready for CSCE 231 Fall 2023.

Development is far enough along that we could incorporate this library into any of the past CSCE 231 labs

Added support for ARM architectures

Extracted CowPi_stdio as a separate library, migrated printf/scanf code from CowPi library to CowPi_stdio library