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.
projectile-project-root no longer returns `default-directory` if not in
a project (it returns nil). As such, doom-project-* functions (and their
uses) have been refactored.
+ doom-project-p & doom-project-root are aliases for
projectile-project-p & projectile-project-root.
+ doom-project-{p,root,name,expand} now has a DIR argument (for
consistency, since projectile-project-name and
projectile-project-expand do not).
+ The nocache parameter is no longer necessary, as projectile's caching
behavior is now more sane.
+ Removed some projectile advice/hacks that are no longer necessary.
+ Updated unit tests
