Improve linked A/V track hierarchy and timeline deletion - #159

Improve linked A/V track hierarchy and timeline deletion#159

gorio wants to merge 2 commits into

CutWire-Studios:mainCutWire-Studios/Drift:mainfrom

gorio:contrib/linked-av-track-hierarchy-deletegorio/Drift:contrib/linked-av-track-hierarchy-deleteCopy head branch name to clipboard