Rename {if,when}! -> eval-{if,when}!

To better represent its purpose, as extensions to Emacs' eval-when*
API (for control flow at compile time).

core/core-lib.el

@@ -220,19 +220,19 @@ writes to `standard-output'."
                    (funcall write-region start end filename append visit lockname mustbenew)))
            ,@forms))))
 
-(defmacro if! (cond then &rest body)
+(defmacro eval-if! (cond then &rest body)
   "Expands to THEN if COND is non-nil, to BODY otherwise.
-COND is checked at compile/expansion time, allowing BODY to be omitted
-entirely when the elisp is byte-compiled. Use this for forms that contain
-expensive macros that could safely be removed at compile time."
+COND is checked at compile/expansion time, allowing BODY to be omitted entirely
+when the elisp is byte-compiled. Use this for forms that contain expensive
+macros that could safely be removed at compile time."
   (declare (indent 2))
   (if (eval cond)
       then
     (macroexp-progn body)))
 
-(defmacro when! (cond &rest body)
+(defmacro eval-when! (cond &rest body)
   "Expands to BODY if CONDITION is non-nil at compile/expansion time.
-See `if!' for details on this macro's purpose."
+See `eval-if!' for details on this macro's purpose."
   (declare (indent 1))
   (when (eval cond)
     (macroexp-progn body)))
@@ -639,7 +639,7 @@ testing advice (when combined with `rotate-text').
 ;;
 ;;; Backports
 
-(when! (version< emacs-version "27.0.90")
+(eval-when! (version< emacs-version "27.0.90")
   ;; DEPRECATED Backported from Emacs 27
   (defmacro setq-local (&rest pairs)
     "Make variables in PAIRS buffer-local and assign them the corresponding values.

core/core-ui.el

@@ -598,7 +598,7 @@ behavior). Do not set this directly, this is let-bound in `doom-init-theme-h'.")
         (run-hooks 'doom-load-theme-hook))
       result)))
 
-(when! (not EMACS27+)
+(eval-when! (not EMACS27+)
   ;; DEPRECATED `doom--load-theme-a' handles this for us after the theme is
   ;;            loaded, but this only works on Emacs 27+. Disabling old themes
   ;;            must be done *before* the theme is loaded in Emacs 26.

modules/checkers/spell/config.el

@@ -64,7 +64,7 @@
 ;;
 ;;; Implementations
 
-(if! (not (featurep! +flyspell))
+(eval-if! (not (featurep! +flyspell))
 
     (use-package! spell-fu
       :when (executable-find "aspell")

modules/lang/python/config.el

@@ -309,8 +309,8 @@
 ;;
 ;;; LSP
 
-(when! (and (featurep! +lsp)
-            (not (featurep! :tools lsp +eglot)))
+(eval-when! (and (featurep! +lsp)
+                 (not (featurep! :tools lsp +eglot)))
 
   (use-package! lsp-python-ms
     :unless (featurep! +pyright)

modules/tools/magit/autoload.el

@@ -6,7 +6,7 @@
 ;;      support symlinks as unix knows them, so `magit-version' can't resolve
 ;;      its own repo's path.
 ;;;###autoload
-(when! IS-WINDOWS
+(eval-when! IS-WINDOWS
   (defadvice! +magit--ignore-version-a (&optional print-dest)
     :override #'magit-version
     (when print-dest