QmlDesigner: Add option forceFreeType to qmlproject

This option enforces the usage of FreeType even on Windows
for the form editor and live preview.
This can be useful when developing for Linux devices.

The option can be eanbled by adding
'forceFreeType: true'
to the .qmlproject file.

Task-number: QDS-1143
Change-Id: I7e749e95584e23202536596ee4f7cdaa09d3a371
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmlprojectmanager/fileformat/qmlprojectitem.cpp

@@ -97,6 +97,11 @@ bool QmlProjectItem::matchesFile(const QString &filePath) const
     });
 }
 
+void QmlProjectItem::setForceFreeType(bool b)
+{
+    m_forceFreeType = b;
+}
+
 Utils::EnvironmentItems QmlProjectItem::environment() const
 {
     return m_environment;