With https://github.com/Alexander-Miller/treemacs/issues/592 merged,
treemacs now fully supports perspective mode. That is, each treemacs
buffer is scoped to a perspective and initializes itself using projectile.
This change re-enables treemacs-persp, enables the `Perspectives` scope,
and adjusts the doom treemacs init behavior to support the new
treemacs-persp behavior.
I haven't been able to reproduce the prior errors with melpa so I think
this is safe to re-enable now. In my testing it seems to work
flawlessly, both with and without persp-mode enabled.
Only one issue is that users might need to remove their treemacs persist
file (`~/.emacs.d/.local/cache/treemacs-persist`) after this change if
using persp-mode. I'm not sure if it is necessary since I blew away my
own before testing.
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