Consolidate Vertex Paint and Weight Paint into Single Mode

Vertex Paint and Weight Paint are already almost identical. They use the same brushes and methods to paint values to vertices (and face corners for Vertex Paint). Vertex Paint handles vector values while Weight Paint handles scalar values. They're historically intended for different purposes, but in modern workflows that line is often blurred.

Proposal:

• Combine into one mode/editor
• Select attribute you want to paint, which determines value you're painting (RGB, float, etc) and domain (vertex, face corner)
• Can also paint edges and faces
• Used to paint Vertex Weights, Color Attributes, and even Attributes
• Suggested Names: Vertex Paint , Geometry Paint , Mesh Paint