Breaking changes coming to Neo-tree

Hi all, I just wanted to issue a warning to anyone using the main branch that we are working on v3.0 right now so that we can push a few breaking changes that have been on hold for a while. If you want to avoid those breaking changes, you should switch over to the v2.x branch or use a release tag.

You can see what breaking changes are going into this release by looking at the milestone.

The biggest changes are a switch to the newer v3 Nerd Font symbols and dropping the old NeoTree* commands.