RPi plugin for utilizing electronic components and sensors

[44yu5h]

• Add support for
  • Digital input & output
  • All kinds of buttons
  • HCSR04 Distance sensor
  • All types of OLED displays
  • Some additional helpful blocks (high, low, delay)
• Simplified installation process
• Readme on how to install and contribute further
• Only appears when running on Raspberry Pi
• All the libraries used have an MIT License.

Update readme and format according to PEP8

[chimosky]

Haven't reviewed yet, but for future reference see the first part of our contributing guide.