Raspberry Pi and armv7hf support

by Gottfried Haider for The Processing Foundation

Port Processing run on the Raspberry Pi and other ARMv6, ARMv7 devices, such as the BeagleBone Black. Implement an Arduino-like library to allow access to on-board peripherals. Create educational resources to help educators successfully use Processing on the Raspberry Pi in the classroom. Package Processing for upstreaming. (Details in below)