New Effect Property Editors (font and captions) + new effect thumbnails #3794
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This is related to OpenShot/libopenshot#583, and adds in some custom UI editors for caption data. Essentially, when a caption property is detected, it emits a signal, and populates the caption editor dock-able widget. This is designed to stay visible, while the user scrubs through the timeline, and allows edits and the creation of new captions.