💥 Replace exec-path-from-shell w/ 'bin/doom env'

IMPORTANT: This is a breaking update for Mac users, as your shell
environment will no longer be inherited correctly (with the removal of
exec-path-from-shell). The quick fix is: 'bin/doom env refresh'. Also,
the set-env! autodef now does nothing (and is deprecated), be sure to
remove calls to it in your config.

Smaller changes:
+ This update also adds --no-* switches to doom quickstart
+ Includes general improvements to the documentation of several bin/doom
  commands.
+ Moves doom/reload* commands to core/autoload/config.el
+ doom/reload-project has been removed (it didn't actually do anything)

The breaking change:
This update adds an "envvar file" to Doom Emacs. This file is generated
by `doom env refresh`, populated with variables scraped from your shell
environment (from both non-interactive and interactive sessions). This
file is then (inexpensively) loaded at startup, if it exists.

+ The file is manually generated with `doom env refresh`.
+ It can be regenerated automatically whenever `doom refresh` is run by
  running `doom env enable` (`doom env clear` will reverse this and
  delete the env file).
+ `doom quickstart` will ask if you want to auto-generate this envvar
  file. You won't need it if you're confident Emacs will always be
  started from the correct environment, however.
+ Your env file can be reloaded from a running Emacs session with `M-x
  doom/reload-env`. Note: this won't work if the Emacs session you're
  running it in doesn't have a correct SHELL set. i.e. don't use this to
  create your first env file!

The idea isn't mine -- it's borrowed from Spacemacs -- and was
introduced to me in #1053 by @yurimx. I was impressed with it. Prior to
this, I was unhappy with exec-path-from-shell (no hate to the dev, I
understand its necessity), and 'doom patch-macos' wasn't ideal for mac
users (needed to be reapplied every time you update Emacs). What's more,
many users (even Linux users) had to install exec-path-from-shell
anyway.

This solution suffers from none of their shortcomings. More reliable
than patch-macos, more performant and complete than
exec-path-from-shell, and easily handled by bin/doom.

core/autoload/ui.el

@@ -81,18 +81,6 @@ See `display-line-numbers' for what these values mean."
                (`nil "disabled")
                (_ (symbol-name next))))))
 
-;;;###autoload
-(defun doom/reload-theme ()
-  "Reset the current color theme and fonts."
-  (interactive)
-  (let ((theme (or (car-safe custom-enabled-themes) doom-theme)))
-    (when theme
-      (mapc #'disable-theme custom-enabled-themes))
-    (when (and doom-theme (not (memq doom-theme custom-enabled-themes)))
-      (let (doom--prefer-theme-elc)
-        (load-theme doom-theme t)))
-    (doom|init-fonts)))
-
 ;;;###autoload
 (defun doom/delete-frame ()
   "Delete the current frame, but ask for confirmation if it isn't empty."
@@ -161,15 +149,6 @@ windows (unlike `doom/window-maximize-buffer') Activate again to undo."
     (while (ignore-errors (windmove-up)) (delete-window))
     (while (ignore-errors (windmove-down)) (delete-window))))
 
-;;;###autoload
-(defun doom/reload-font ()
-  "Reload `doom-font', `doom-variable-pitch-font', and `doom-unicode-font', if
-set."
-  (interactive)
-  (when doom-font
-    (set-frame-font doom-font t))
-  (doom|init-fonts))
-
 ;;;###autoload
 (defun doom/set-frame-opacity (opacity)
   "Interactively change the current frame's opacity.