Introduce synchronize merge method

* Create history-based merging that keeps older data in history instead of discarding or deleting it
* Extract merge logic into the Merger class
* Allows special merge behavior
* Improve handling of deletion and changes on groups
* Enable basic change tracking while merging
* Prevent unintended timestamp changes while merging
* Handle differences in timestamp precision
* Introduce comparison operators to allow for more sophisticated comparisons (ignore special properties, ...)
* Introduce Clock class to handle datetime across the app

Merge Strategies:
* Default (use inherited/fallback method)
* Duplicate (duplicate conflicting nodes, apply all deletions)
* KeepLocal (use local values, but apply all deletions)
* KeepRemote (use remote values, but apply all deletions)
* KeepNewer (merge history only)
* Synchronize (merge history, newest value stays on top, apply all deletions)

src/autotype/AutoType.cpp

@@ -756,10 +756,9 @@ bool AutoType::verifyAutoTypeSyntax(const QString& sequence)
         }
     } else if (AutoType::checkHighRepetition(sequence)) {
         QMessageBox::StandardButton reply;
-        reply = QMessageBox::question(nullptr,
-                                      tr("Auto-Type"),
-                                      tr("This Auto-Type command contains arguments which are "
-                                         "repeated very often. Do you really want to proceed?"));
+        reply =
+            QMessageBox::question(nullptr, tr("Auto-Type"), tr("This Auto-Type command contains arguments which are "
+                                                               "repeated very often. Do you really want to proceed?"));
 
         if (reply == QMessageBox::No) {
             return false;