wm/marswm: update to 0.5.1

- Fixing windows getting lost when switching off their monitor
- Fixing windows staying hidden on monitor disconnect
- Bump dependencies
- Improving language quality
- Adding keybinding to increase/decrease gap size
- Fixing overflow issues with unreasonably huge gaps in layouts.rs
- Fixing Level3 modifier being wrongfully bound
- Fixing client decoration on workspace switching
- Warping pointer on window activation
- Fixing restacking on floating layout
- Allow dialogs to be resized by their programs
- Allow moving fullscreen windows with the mouse
- Fixing crash on move_main
- Fixing moving of fullscreen windows between monitors
- Fixing bug with previous fix regarding move_main
- Prefer fullscreen windows when focusing after switching workspace

(pin)