revert: restore pre-upstream-merge baseline (tree of 3b673150b)

Roll the tree back to the pre-merge tip 3b673150b, undoing the upstream sync merge 72f4f186d (303 files) and the 13 post-merge commits layered on top of it.

Purpose: restore the last pre-sync baseline so the reported OMEMO/OTR encryption regressions can be reproduced against a known-good state and the upstream sync ruled in or out as the cause. Nothing is dropped from history; the merge and every post-merge commit remain reachable and can be cherry-picked back selectively.

Baseline:     3b673150b chore(chatlog): disable background message file logging (stage 1)

Undoes merge: 72f4f186d merge: sync upstream profanity-im/profanity

tests/unittests/log/stub_log.c

@@ -3,7 +3,21 @@
  *
  * Copyright (C) 2012 - 2019 James Booth <boothj5@gmail.com>
  *
- * SPDX-License-Identifier: GPL-3.0-or-later WITH OpenSSL-exception
+ * This file is part of Profanity.
+ *
+ * Profanity is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Profanity is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Profanity.  If not, see <http://www.gnu.org/licenses/>.
+ *
  */
 
 #include <glib.h>
@@ -46,10 +60,10 @@ log_msg(log_level_t level, const char* const area, const char* const msg)
 {
 }
 
-const gchar*
+const char*
 get_log_file_location(void)
 {
-    return mock_ptr_type(gchar*);
+    return mock_ptr_type(char*);
 }
 
 int