Maintain ALT to activate the selected mouse Pointer. Also possible to ALT LOCK for maintaining the cursor. Local popup window allows selecting. Changed the View options selection to match this popup approach.
For this new MousePointer to snap to grid, a Grid specific for each view is necessary. Grid for moving is orthographic (with an aspect ratio), and grid for mixing or rotation is in polar coordinates. Rendering is done with new Primitives. The entire calculation of grab coordinates is changed to be able to snap to grid coordinates in all circumstances.
StreamSource now have the option 'restart on deactivation' like MediaPlayer. This option is saved in XML (added Visitors for Stream and StreamSource). The GUI is added as sub-menu in play bar (like for MediaPlayer). Some StreamSource subclasses needed to be fixed to allow this feature (e.g. MultiFileSource).
Enable playing and seeking into a timeline on a media player that loaded an image. Timeline sets a duration (end) and is saved/loaded. Add a gstreamer imagefreeze element in the pipeline to simulate a playable stream. Distinction must be made between 'isImage' (what was loaded) and 'singleFrame' (what is in the pipeline). GUI is added and customized with menu and dialog.
Play speed slider changes the speed without changing direction (not working well). Change play direction is now in a play sub-menu (mouse over) in play bar. Video menu changed, with Timeline section
Change implementation of gst pipeline in MediaPlayer to use gstreamer playbin. This makes everything works more smoothly (including instant rate change). This also opens the possibility to allow audio mixing. Other bugfixes include set play speed rate at start, add video effects on reopen media player.
New behavior left panel depending on settings of always_visible panel. Remembers (access from UserInterface) the source that is currently selected in the left panel, and use this source as the one manipulated in TextureView. List possible source new source modes with large icons (instead of combo box).
Enable use of a source as mask for another source. Improved Mask mechanism in Source class, with various flags for update of source (avoid repeated mask update (GPU costly). Using SourceLink to link source to mask (improved robustness of SourceLink).
