Better halftone pattern and more!

All versions of MRMO-Halftone now feature a better halftone pattern, and the old "Halftone Pattern Brightness" adjustment is now retooled to "Dot Gain". The dots in the halftone pattern can now overlap better, providing better and customizable ink coverage.

The halftone pattern rotation was reworked to feature better default angles.

A "Soften" adjustment was also added, to help break the hard halftone pattern edges, especially when processing pixel art.

The Input Image node group also features some adjustment parameters to help tune the input image before it's sent to the shader process.