Add in editor terminal and remove terminal from application

[gk646]

Add a terminal in some way inside the editor (or possibliy repurpose the existing outside one?)

It would be nice as a fully fledged thing thats toggleable and extendable from the bottom with CTRL+T.

This could possbily also serve for future scripting or generation or deeper interaction with the editor

Then remove the terminal on windows by using a WINMAIN main() function.