Improved Tracker & Object Detector Effects (Refactor, Bug-Fixes, Enhancements)

[jonoomph]

Related PR: OpenShot/libopenshot#950

Improvements:

• Fixed timeline tooltips on clip titles, effects and parent badges (bootstrap js update)
• Disable "Process Effect" button after clicked
• Fixed right click menu on "Selected Object" property editor (it was broken). Added "class_name: object id" as format.
• Added ability to clear class_filter (on Object Detector effect)
• Removing child_clip_id property, replacing with parent property for the actual child clips (I.e. parent any clip on a tracked object I'd)
• Fix sorting of tracked object properties in the Property Editor
• Added lots of new documentation for Effects, including Tracker & Object Detector effects. New docs on Parenting also include.
• Large refactor of context menus in OpenShot (when they contain more than 20 items of sub-items). Nested menus now contain a range of items (I.e. 1-20, 21-40, etc...). Applied this format to all Property Editor context menus used in OpenShot.
• Added 'class_filter' context menus, to choose between any visible tracked object classes (I.e. car, truck, etc...)
• Fixed undo/redo issues related to effect property's being updated. For example, some effect updates (or tracked object property updates) would not undo correctly.
• No longer show context menus for read-only properties
• Migrate old *.osp projects that include Tracker or Object Detector effects, to fix alpha values, move child_clip_id to the parent property, etc...
• Bump version of OpenShot to 3.1.1-dev

Prompting user if Tracker effect region is invalid (i.e. not at the beginning of the clip), and then jumping the preview to the first frame. Otherwise, if a user chooses a region further into a clip, the Tracker can often fail to ever correctly track this region, since it always begins tracking on the 1st frame of the clip.

Improved Selected Object menu (Object Detection Effect)

New Parent Badge (for any clip which has a parent set):

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Refactor Object Detector with QPainter (support for corner radius, faster drawing performance)

Refactor Tracker with QPainter (support for corner radius, faster drawing performance)

[jonoomph]

Tracker Effect has serious regressions (different types crash, attributes don't work, poor performance)