Interp Track Linear Color Base
Editor Properties: (see get_editor_property/set_editor_property)
active_condition(TrackActiveCondition): [Read-Write] Sets the condition that must be met for this track to be enabled
curve_tension(float): [Read-Write] Tension of curve, used for keypoints using automatic tangents.
sub_tracks(Array(InterpTrack)): [Read-Write] A list of subtracks that belong to this track