mrv2 v1.1.3

• pyFLTK build improvements (removal of warnings).
• Made Windows .zip file smaller by removing unit tests.
• Added Linux Desktop name to About Window.
• Fixed update-mrv2.py plug-in for Windows. The install location is now retrieved from the registry. Only if not found it looks in hard-coded paths.
• Install update-mrv2.py always, instead of removing it when python demos was not installed.
• Added instructions on Windows on how to retrieve the Explorer thumbnails.
• Darby added automatic scrolling of the timeline when playing and ability to toggle track and clip info.
• Added Darby's new options to Network connections.
• New action icons, which should display properly at high resolutions.
• New custom file requester icons, which should display properly at high resolutions.
• Sped up comparison wipes with Alt and Shift dragging.
• Sped up color corrections from the Color Panel.
• Fixed libdecor incompatibility with older libdecor plug-ins.
• Fixed + and - signs rotating the image when using one of the draw tools and
  not just the pencil tool. With all of them now the pencil size is changed.
• Fixed Python installation on macOS on a re-release two days later.