ui: Indexing UI

* Added DialogView with QtDialogView implementation to handle information dialogs
* Implemented QtIndexingDialog class that covers all different dialogs for indexing
* Directly communicate with DialogView from Prpject and all Tasks involved in indexing
* Block QtMainWindow UI while indexing

src/lib/utility/TimePoint.h

@@ -6,6 +6,8 @@
 class TimePoint
 {
 public:
+	static TimePoint now();
+
 	TimePoint();
 	TimePoint(boost::posix_time::ptime t);
 	//TimePoint(time_t t);
@@ -22,7 +24,9 @@ public:
 	inline bool operator<=(const TimePoint& rhs){ return m_time <= rhs.m_time; }
 	inline bool operator>=(const TimePoint& rhs){ return m_time >= rhs.m_time; }
 
-	inline float operator-(const TimePoint& rhs){ return (m_time - rhs.m_time).total_milliseconds() / 1000.0f; }
+	inline float operator-(const TimePoint& rhs){ return deltaMS(rhs) / 1000.0f; }
+
+	size_t deltaMS(const TimePoint& other) const;
 
 private:
 	boost::posix_time::ptime m_time;