Add ability to rename copters directly from the server table

[goldarte]

Request description
Add a clear solution for the user in UI to change the name of the copter.

Describe the solution you'd like
I think that the most convenient way is to double-click to cell with copter name, rename it and then press Enter button

Describe alternatives you've considered
Another way is to add separate button called "Rename copter"

[artem30801]

Should that affect copter_id on copter?

[goldarte]

This ability is added, but now renaming id with the hostname requires restart of Raspberry Pi. We should try to do the renaming without restarting all, but with restarting only necessary services of Raspberry Pi.

[goldarte]

Added necessary settings in [SYSTEM] section of client configuration in v0.4