* Use NOZZLE_PARK_FEATURE for ADVANCED_PAUSE_FEATURE

adds setup for the original Radds Display+Controller+SD Card Reader PCB
http://doku.radds.org/dokumentation/lcd-display/

* Adding support for using the MKS_12864OLED with the SSD1306 controller

* Update comment for correct controller type

User could enable SERIAL_XON_XOFF on USB-native devices and it would not be enabled without warning, but M115 would report the capability as available.

-Report SERIAL_XON_XOFF in Extended Capabilites M115 report for hosts
-Remove outdated 256 size limitation from comments on RX_BUFFER_SIZE defines
-Update error message conditions

This is a non-intuitive change.   @oldmcg says in this post https://github.com/MarlinFirmware/Marlin/issues/7572#issuecomment-340641207 that using DELTA_PRINTABLE_RADIUS is better than DELTA_PROBABLE_RADIUS for setting the probe limits.   This is because the automatic probe code checks all locations for being reachable by the probe prior to doing the probe.

* Fix some 8-bit Teensyduino compile warnings

-Override Teensyduino legacy NOT_A_PIN 127 define
-some fixups for Printrboard_RevF pins

* Proper cleanup of Printrboard Rev.F pins

* Apply LCD fixes to Printrboard v1