- DLL copying belongs in qgroundcontrol.pro, not qupdate.pro
- Turn on link time code generation for better (global) optimization

- MAV resets the RC_DSM_BIND param back to 0 automatically but QGC
doesn't know about this and thinks the parameter hasn't changed when the
pair button is hit a second time. Since it thinks the param has not
change, it doesn't transmit the update.
- This implements method to allow to optionally force QGC to send the
update. By default it does not
- Also added copy statements to include the two missing DLLs
(QtDeclarative and QtScript) automatically as part of Windows build.

First, stupid, naive version of PX4 uploader, needs testing and cross-platform fixes. Compiles, ready for testing