Improvements

Changed at which point we capture the current frame to a QImage and also when we grab the motion detection rectangle for current detected motion. Also changed the timer update period for drawing main form.

Made improvements to how the FPS is computed and used when recording.

Also made several minor improvements and tidied code and comments in several places.

Update README.md

Now requires OpenCV 4.0.1 and CoreLibrary linked as static lib instea…

…d of as dynamics lib.

Also rebuilt tested using Qt 5.12/Qt Creator 4.8.

Minor fixes and extra debug added

Updated ReadMe.md plus screenshots

Oops fixed readme

Tweaked logic when FPS change is detected

NOw we recreate video capture object as well

Fixed disk manager used space calculation bug

Adaptive FPS added

Monitor FPS of incoming streams and adapt if changes are spotted.