v79 - Patch Release

Priority

• Merge PR #427 "Fix detect system is a raspberry pi"
• Fix GPIO numbers for BSC SPI and update documentation.

Maintenance

• Merge PR #419 SENT_protocol
• Fix issue #405 Prototype for gpioRunScript is duplicated.
• Fix issue #400 PI_CMD_EVT is unused in pigpiod_if2.c
• Fix issue #397 gpioSetTimerFunc NULL cancel error
• Fix Issue #402 Cannot handle multiple I2C devices on RPi 4B
• Merge PR #415 fix simple type receieve -> receive
• Merge PR #413 Update doc: return current PWM dutycycle instead of 0
• Merge PR #404: Include stddef.h for size_t
• Reworked bit bang example code (paulvee)