- Changed regions to use the whole main region for such views as curves and dopesheet. This allows to have own panels with tools/properties in this areas. - Active clip is getting synchronized between different clip editor editors in the same screen, so updating of curve/dopesheet views happens automatically when one changes current clip in one of this editors. - Curves and dopesheet are still using PREVIEW region type instead of re-using main region. - To deal with vertical synchronization in dopesheet, re-initialization of preview region happens. - Panels in toolbox and properties panels are now separated to rely on current view mode, some operators and poll functions still need to be updated. - Added new screen called "Movie Tracking" where layout is configured to display timeline, main clip window, curves and dopesheet.