Ability to set device name without suffix

[nmaupu]

Description:

Add the ability to ForceDeviceName without suffixing the last 6 digits' mac address. Simply compile with -DForceDeviceNameNoSuffix to do so.

Need to be careful that each device has a distinct name so that there is no collision during discovery.

Also added :

• missing "tempc" and "tempf" (keeping "temp" which is celcius for backward compat).
• rssi diagnostic value for all connectable devices.

Checklist:

• The pull request is done against the latest development branch
• Only one feature/fix was added per PR and the code change compiles without warnings
• I accept the DCO.