Mask related utility class.
This class provides masking-specific utility functions.
| FindRootSortOverrideCanvas | Find a root Canvas. |
| GetRectMaskForClippable | Find the correct RectMask2D for a given IClippable. |
| GetRectMasksForClip | Search for all RectMask2D that apply to the given RectMask2D (includes self). |
| GetStencilDepth | Find the stencil depth for a given element. |
| Notify2DMaskStateChanged | Notify all IClippables under the given component that they need to recalculate clipping. |
| NotifyStencilStateChanged | Notify all IMaskable under the given component that they need to recalculate masking. |