This is required to benefit from crisp display on hiDPI monitors.
This also fixes issues related to fullscreen and input handling
when using an hiDPI display on Windows.
* 2d/physics_platformer works flawlessly on Godot 3.1 beta 8
* fix warnings for inferred node type
* every script has a class_name
* formatted code for better clarity
* each files has its own subfolder
* bullet collisions and shooting have to be executed from call_deferred
* PascalCase naming for nodes
- Added the Z key to shoot so that the input follows the same input as Platformer3D
- Fixed the particles in the bullet scene so that it follows the same look as Platformer3D
- Changed the scaling for the window from none to 2D
