Hotfix. Python version / Numpy version compatibility issues

Updates in `examples/`, keeping up w/ the latest OpenCV

Reboot: wrong arguments

- MAV_CMD_PREFLIGHT_REBOOT_SHUTDOWN command used to be provided w/ the wrong
  set of arguments

Added MAVLink 1-compatible implementation of MAVLink Wi-Fi commands. …

…Namely:

- Connect to a Wi-Fi Access Point (STA mode);
- Disconnect from a Wi-Fi Acccess Point (STA mode);
- Change the AP's SSID or password.

Lua Compiler: path to the compiler on Windows systems

MAVLink FTP, buffer issues.

Examples, objects lifecycle management

- Fixed `camera_calibration` script;
- Added `Pioneer` objects lifecycle management facilities;
- Restored previously deleted `aruco_flight` example script

Ref. Restored support for python 3.7.

.

Setup process, missing dependencies