This reverts commit 2dfa6ca72a2e8d43caf4932ca0d35792f0638917. Revert "Base HAL SPI Changes" This reverts commit 2afc521b8b6a81b2281a038f1b99a69f4a008e64. Revert "Initial HAL SPI API" This reverts commit 58f7ffe09ab5bc034b6510f5204f8d342138abaa.
Fixes Arduino IDE builds for 8-bit AVR, misc: Adafruit NeoPixel currently incompatible with Teensy 3.5-6, blacklisted