moved fake esc and lmb between getDropFileURL and draggingInfoSending, otherwise it would make getDropFileURl return null or fail to fake lmb up on carbon hardware layer, then can not move mouse back from client

git-svn-id: http://svn.synergy-foss.org/trunk@1897 33c40d52-04ba-11de-a43f-ff96a2b7a9af
Feature to drag a file from Windows (client) to Mac (server):
- changed the size of the window for dragging on Mac to 3 by 3 pixels.
- on server side, use a new thread to write file to the drop directory.


git-svn-id: http://svn.synergy-foss.org/trunk@1898 33c40d52-04ba-11de-a43f-ff96a2b7a9af