File/tree list view next to code pane

[chr15m]

Adding a Files tab when starting a new "project" (left of the index). For better navigation.
I usually have multiple files open as tabs, and it can get clogged very fast with the second half of the screen in the "Next to code" preview.
Just a simple list or tree view to easily go around multiple files would certainly do the trick.

https://twitter.com/LordOfThePies4/status/1338293147525373953