Kdenlive code changes since 18.08.0:
- enable windows mingw crash handler
- Fix proxy creation not restarting when changing a property while creating proxy
- Fix clip proxy on autorotate
- Fix effects parameters parsing (regression since QtScript drop)
- Give priority to local effects over system ones
- Access to MLT debug info (command line option)
- Fix OffScreenSurface creation in GUI thread
- Increase max unzoom level, uniform zoom factor

W64 packaging updates
- Upgrade Qt to 5.11.1, KDE Frameworks to 5.47
