Essential 2D Shaders Updated to v4.1.1!

The Essential 2D Shaders have been updated to version 4.1.1! The following has changed:

1. Fullscreen pulse shader:

• Completely reworked the fullscreen renderer feature framework to accomodate the changes in URP 13+/Unity 2022.1+:
• Upgraded the now obsolete RenderTargetHandle workflow to RTHandles for Unity 2022.1+.
• Upgraded the shader to a fullscreen Shader Graph for Unity 2022.2+ (previously an unlit Shader Graph).
• Encapsulated the custom render pass into a profiler for enhanced debugging information in the Frame Debug window.
• Improved releasing of texture resources in the custom render pass.
• Unity version 2021.3 remains unaffected.
• Updated documentation with the new changes.
• Demo scene showcase now has screen fade on pulse enabled by default.
• Fixed a bug on Unity 2022.2.x where exiting playmode before the fullscreen pulse was finished caused scene editor controls to turn into a white texture.
  
• Fixed a bug on Unity 2022.2.x where the fullscreen pulse was rendered twice on top of itself.
• Fullscreen pulse no longer renders in the scene editor on Unity 2021.3.x.

2. Other:

• Set Universal Renderer shaders to be transparent instead of opaque (setting them to opaque makes materials invisible on Unity 2022.1+).
• Fixed some 2D Renderer materials using Universal Renderer shaders.
• Fixed the example 2D Renderer using a Universal Renderer material.