Make the hitobject masks move within their placement/selection
# Conflicts:
# osu.Game.Rulesets.Osu/Edit/Masks/HitCircleMasks/Components/HitCircleMask.cs
# osu.Game.Rulesets.Osu/Edit/Masks/HitCircleMasks/HitCircleSelectionMask.cs
# osu.Game.Rulesets.Osu/Edit/Masks/HitCirclePlacementMask.cs
# osu.Game/Rulesets/Edit/PlacementMask.cs