Hotplug support for joysticks
"Detect joysticks" button now detects joysticks that have been connected after game started.
Cherry-picked from: https://github.com/ManaPlus/ManaPlus/pull/42
"Detect joysticks" button now detects joysticks that have been connected after game started.
Cherry-picked from: https://github.com/ManaPlus/ManaPlus/pull/42