Add qmlImportPaths property to .pyproject file

Users should be able to add custom QML import paths for
Python/PySide2/PyQt5 projects in Qt Creator in order to
get syntax highlighting and code completion for custom
QML modules.

Fixes: QTCREATORBUG-23679
Change-Id: Iec7c691c4b8709c48a790cd27ac7c6e755967796
Reviewed-by: hjk <hjk@qt.io>

src/plugins/python/python.qbs

@@ -4,6 +4,8 @@ QtcPlugin {
     name: "Python"
 
     Depends { name: "Qt.widgets" }
+
+    Depends { name: "QmlJS" }
     Depends { name: "Utils" }
 
     Depends { name: "Core" }