GDevelop 5.0.0 Beta 137

What's new in this version:

Improvements:
- Update all dark themes and rework the light theme entirely to have a modern look and feel
- Improve/fix the drag'n'drop to allow again horizontal movements to quickly move an event
- Add mass and moment of inertia expressions for the Physics behavior
- Suggest all expression types in autocompletions of expressions
- Also automatically convert number expressions to text (using ToString()) when needed
- Add WebManifest to exported web games
- This allows a game hosted on a website to have a proper icon and orientation when a shortcut to it is added to the home screen on Android or iOS

Extensions, assets and examples:
- [BoidsMovement] Add an extension to simulates flocks movement
- [PixelPerfectMovement] Fix: top-down characters moving on a grid no longer go side way after colliding with an obstacle.
- [CursorMovement] Fix conditions were always returning true when called a 2nd time.
- Add a new pack: Pixel Platformer by Wishforge Games
- Removed the "simple checkpoints" custom extension from the Platformer example
- Add an example to show how to simulate a flock movement with the "Boids movement" extension
- [TopDownGridMovement] Add obstacles
- Add "The Conviction of Gun Dude Mobile"
- A mobile version of the desktop game of the same name, with dual joysticks to be played on a touchscreen and an adapted difficulty!

Fixed:
- Fix the physics engine contacts/collisions between objects not detected when they happened shortly between frames
- Fix clicks on checkboxes that are far from the label on the same line in the editor
- Fix asset thumbnail sometimes having a wrong size when navigating the Asset store
- Fix category of "Error of last save attempt" leaderboard expression