Dark theme and EV3 BT fixes

• Initial support for system-wide theme for Windows and macOS. Dark and high contrast themes look good enough, but were totally useless before.
• New shortcuts: a shortcut to return the robot to start position (CTRL+R); and CTRL + I to load world model
• Now there is a list of recent files in File menu.
• Fixed issue for NXT and EV3 kits on some macOS hosts (failed to load plugin)
• Fixed EV3 plugin issue with BT connection on Windows.
• Some improvements for unattended installation
• Multiplication operation to xml fields

New Contributors

• @AlexandrKudrya made their first contribution in #1896

Full Changelog: 2025.1...2025.2