fix(mu4e): support mu 1.8

Thanks to some combination of ignorance and obstinance, mu4e has thrown
compatibility to the wind and completely ignored the exitance of
define-obsolete-function-alias. Coupled with the inconsistent/partial
function renaming, this has made the mu4e 1.6⟶1.8 change particularly
annoying to deal with.

By suffering the pain of doing the mu4e author's work for them, we can
use defalias to give backwards compatibility a good shot for about 60
functions. Some mu4e~x functions are now mu4e--x, others are unchanged,
and then you've got a few odd changes like mu4e~proc -> mu4e--server and
mu4e-search-rerun. The form of message :from entries has also changed,
and a new (mu4e) entrypoint added supplanting mu4e~start.

Fix: #6511
Close: #6549
Co-authored-by: Rahguzar <aikrahguzar@gmail.com>

modules/email/mu4e/autoload/email.el

@@ -67,7 +67,7 @@ default/fallback account."
     (setq +mu4e--old-wconf (current-window-configuration))
     (delete-other-windows)
     (switch-to-buffer (doom-fallback-buffer)))
-  (mu4e~start 'mu4e~main-view)
+  (mu4e)
   ;; (save-selected-window
   ;;   (prolusion-mail-show))
   )
@@ -188,6 +188,8 @@ is tomorrow.  With two prefixes, select the deadline."
                   (lev (org-outline-level))
                   (folded-p (invisible-p (point-at-eol)))
                   (from (plist-get msg :from)))
+              (if (consp (car from)) ; Occurs when using mu4e 1.8+.
+                  (setq from (car from)))
               ;; place the subheader
               (when folded-p (show-branches))    ; unfold if necessary
               (org-end-of-meta-data) ; skip property drawer

modules/email/mu4e/autoload/mu-lock.el

@@ -76,7 +76,7 @@ Else, write to this process' PID to the lock file"
   "Handle another process requesting the Mu4e lock."
   (when (equal (nth 1 event) 'created)
     (when +mu4e-lock-relaxed
-      (mu4e~stop)
+      (mu4e--stop)
       (file-notify-rm-watch +mu4e-lock--file-watcher)
       (message "Someone else wants to use Mu4e, releasing lock")
       (delete-file +mu4e-lock-file)
@@ -90,4 +90,4 @@ Else, write to this process' PID to the lock file"
       (setq +mu4e-lock--file-just-deleted t)
       (when (and +mu4e-lock-greedy (+mu4e-lock-available t))
         (message "Noticed Mu4e lock was available, grabbed it")
-        (run-at-time 0.2 nil #'mu4e~start)))))
+        (run-at-time 0.2 nil #'mu4e)))))