Blender Knife Tool Improvements

This proposal aims to bring a selection of much needed improvements to the knife tool in Blender which will better the modelling workflow of the tool. It proposes such changes as the ability to undo individual steps of the cutting process, a visual measure of distance and angles per cut, more precise angle control in constrained angle mode, the ability to snap cuts to global or local orientation, knife usage in multi-object edit mode and an edge removal mode.