Inspector: Use user-set sysroot also when opening files in the inspector

Expose the current debugger engine (with it's start parameters) in
Debugger::QmlAdapter, and use it to initialize the FileInProjectFinder
in QmlJSInspector.

Change-Id: I562012868e72ee9369db210e79468e263c53eda6
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>
Reviewed-by: Christiaan Janssen <christiaan.janssen@nokia.com>

src/plugins/debugger/qml/qmladapter.h

@@ -67,6 +67,7 @@ public:
     bool isConnected() const;
 
     QmlJsDebugClient::QDeclarativeDebugConnection *connection() const;
+    DebuggerEngine *debuggerEngine() const;
 
     bool disableJsDebugging(bool block);