5.3.0

• Improved mobile UI by removing unnecessary padding and margins.
• Overhauled video previews on mobile. These now render in place of the video rather than on the timeline.
• Added two new tasks for optimising previews and thumbnails. These heavily optimise the PNGs at the cost of quality. These tasks aren't executed by default because they sometimes add odd colouring and for previews the frames sometimes don't line up. This will allow loading previews for long videos on mobile devices to be much quicker.