Add ProCam2D plug-in

[daz-b-like]

Please add ProCam2D for Godot 4.x and ProCam2D Godot 3.x.

Introducing the ProCam2D plugin! ProCam2D is the ultimate camera solution for all your 2D game development needs, offering precise control over camera behavior. Whether you're looking to implement smooth camera movements, dynamic zooms, or exciting screen shake effects, ProCam2D has you covered. It features target-based tracking, multiple screen shake options, flexible drag and rotation controls, and zoom and boundary limits. The plugin is powered by a globally accessible singleton, ensuring efficient performance. Enhance your game's visual experience with ProCam2D's versatile and user-friendly features.