Packages that need to be loaded on emacs startup, should just be loaded
through use-package in a non-deferred manner.
It makes no real difference to startup, loading the packages either
slows down emacs before "startup" is complete, or right after it
completes. End result is that Emacs is unresponsive for basically the
same amount of time regardless.
Due to changes to use-package's :custom option, my abuse of it to set
custom variables no longer works and yields errors.
Instead correctly set custom variables with defvar.
If you launch Emacs by giving it a file to open, the auto-loading of the
default desktop would remove that file, as it is not likely to be part
of the default desktop.
Instead desktop management is now disabled until you specifically load a
desktop with `desktop+-load-or-create` (bound to `C-z C-z C-s`).
Most visual/theme related frame parameters I prefer coming from the
active config, rather than being restored to what they were when the
desktop/session file was saved.
