Use SessionNoLoadPost autocmd

[janie314]

Issue

The documentation currently shows how to load Neotree or similar buffers automatically after a session load.

However, it is often desirable to load buffers like that even if a session is not loaded automatically.

Therefore, I propose we call the autocmd SessionNoLoadPost if a session is not found to be loaded. Then it would be easy to setup Neovim to always load Neotree, regardless of whether/not a session is available to be restored.

Other

If we agree this is a good idea, I'm happy to code a PR for this myself!

[Shatur]

Can you configure to open any buffer at startup using built-in autocommands and check if you are inside a session?
Because SessionNoLoadPost sounds a bit odd to me.