Reboot button

#### Issue details
Like iNav or Betaflight it should have reboot button or (save and reboot), and make at common place where it can be accessed from all tabs may be before ARDUPILOT logo.

#### Version
_What version was the issue encountered with_
All versions
#### Platform
[ ] All
[ ] AntennaTracker
[ ] Copter
[ ] Plane
[ ] Rover
[ ] Sub

#### Airframe type
_What type of airframe (flying wing, glider, hex, Y6, octa etc)_
Not applicable

#### Hardware type
_What autopilot hardware was used? (pixhawk, pixracer, PX4FMU etc)_
Not applicable

#### Logs
_Please provide a link to any relevant logs that show the issue_
Not applicable

Start by locating Mission Planner’s shared UI area and the existing save or reboot command handling. Confirm how a control can remain available from every tab, then verify that it performs reboot or save-and-reboot correctly across the supported vehicle types.

Written by the indexing model from the issue text.