Added libs; prepare network startup change

Added the libraries to the repository
Preliminary changes to fix slow startup when no network cable is
connected
Network startup & other changes

Changed network startup to avoid long delay if no network cable is
connected
Enable DHCP support if IP address is configured as 0.0.0.0 (not working
yet)
Move thermistor parameters to M305, added parameter to configure series
resistance
Added B and W PID parameters