Task #3951 - Clear filename stored in synwinxt on mouse up

- renamed some functions for file drag/drop to be more similar to existing
- improved log messages for the library loader
- removed hack that blocked .exe and .lnk files (annoying for developers)
- removed hack that always clears dragging filename (not very robust)

src/lib/synergy/Screen.cpp

@@ -417,15 +417,15 @@ CScreen::pollActiveModifiers() const
 }
 
 bool
-CScreen::getDraggingStarted() const
+CScreen::isDraggingStarted() const
 {
-	return m_screen->getDraggingStarted();
+	return m_screen->isDraggingStarted();
 }
 
 bool
-CScreen::getFakeDraggingStarted() const
+CScreen::isFakeDraggingStarted() const
 {
-	return m_screen->getFakeDraggingStarted();
+	return m_screen->isFakeDraggingStarted();
 }
 
 void
@@ -452,6 +452,12 @@ CScreen::getDraggingFilename() const
 	return m_screen->getDraggingFilename();
 }
 
+void
+CScreen::clearDraggingFilename()
+{
+	m_screen->clearDraggingFilename();
+}
+
 const CString&
 CScreen::getDropTarget() const
 {