Piview

The following are implemented in this version:

- host name
- interface names
- ip addresses
- mac addresses

Fixed missing self references in classes, removed `get` from function names
Added missing file headers...

The following have been implemented:

- boot time
- model
- serial number
- uptime
- revision

Added Hardware checking for:

- SPI
- I2C
- BT

Updated [[README]]
Design and added PiView Icon

Added:

- GPU temperature

Added:

- max load across cores
- processor temperature
- processor clock speed

Small fixes to setup.cfg, and a source reformat.