Merge pull request #15 from pez4brian/master

Convert sharpen filters to QML
Update all translations due to string relocations in previous commit.
Refactor to use QmlUtilities::qmlDir().
Update build for libepoxy and upstream Movit master.
Pass UTF-8 string to MLT in Mlt::Controller::open().
Add CuteLogger and start logging to a file.
Fix CuteLogger build on Windows.
Integrate mlt_log with CuteLogger.
Log startup activity.
Make avformat producer cache a minimum of 4.
Test MLT XML for GPU processing compatibility upon open.
Convert whitebalance filters to QML