- Rename RNA SpaceSeq.show_strip_overlay to show_overlays matching the 3D View, the term "strip" was misleading as this is used for the preview as well. - Rename various RNA overlay settings to overlay_frame since "Frame Offset" is a specific feature, avoid having both Editor.show_overlay and SpaceSeq.show_overlays. - Rename Editing `over_*` -> `overlay_frame_*` in DNA, as well as flags.