Locator: Support QML symbols too

The Locator can locate symbols: https://doc.qt.io/qtcreator/creator-how-to-move-to-symbols.html#locate-symbols

However, if I try to find symbols when a QML document is open and the QML Language Server is running,

• "Symbols in Current Document" presents an empty list
• "Symbols in Workspace" shows C++ symbols only

Notes

In contrast,

• "Find References to Symbol" (https://doc.qt.io/qtcreator/creator-editor-how-to-find-symbols.html#find-references-to-a-symbol ) works fine for QML symbols
• The Locator's "Functions and Methods in Workspace" filter works fine for QML functions