ui/workspaces: general refactor
ui/workspaces: general refactor

- Fixes #1506: unsets uniquify-buffer-name-style to work around breakage
  in persp-mode having to do with buffers being retrospectively renamed.
  See Bad-ptr/persp-mode.el#104.
- Move creation of main workspace into persp-mode-hook, to ensure main
  workspace always exists and nil workspace is never active.
- Remove +workspaces|init-frame and significantly reduce LOC in
  +workspaces|init to the bare essentials. This _may_ break persp-mode
  in daemon Emacs, but I'll deal with that next.

UndeadKernel/emacs_doom,UndeadKernel/emacs_doom,hlissner/doom-emacs,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/doom-emacs,UndeadKernel/emacs_doom,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d