Show locator filter descriptions more prominently

- Sort items in the menu.
- Disable items for disabled filters.
- Show a tool tip when hovering over the magnifying glass menu.
- Add descriptions to all filters and make them more consistent.

Change-Id: Ic03e303c50422f9de5dd3c512fe32bbdc958d2ba
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/qmljstools/qmljsfunctionfilter.cpp

@@ -20,6 +20,7 @@ FunctionFilter::FunctionFilter(LocatorData *data, QObject *parent)
 {
     setId("Functions");
     setDisplayName(Tr::tr("QML Functions"));
+    setDescription(Tr::tr("Locates QML functions in any open project."));
     setDefaultShortcutString("m");
     setDefaultIncludedByDefault(false);
 }