Add shadowing for LaPDXYExclusion

[rocco8773]

Update LaPDXYExclusion such that a shadow exclusion region is generate if an exclusion region is inserted between the backside of the LaPD chamber and the insertion point of the probe.

---

Included in this PR:

• Creation of GovernExclusion. GovernExclusion is sub-classes BaseExclusion and is sub-classed just like BaseExclusion is. There are two distinct differences between the two: (1) BaseExclusion should always generate its exclusion mask independent of the global mask while GovernExclusion can inspect the global mask to generate its exlusion mask, and (2) BaseExclusion AND's its exclusion mask with the global mask while GovernExclusion replaces the global mask with its exclusion mask.
• Updated MotionBuilder to leverage the inclusion of GovernExclusion's. MotionBuilder only allows one GovernExclusion to be defined and it is always executed last during the building of the global mask.
• Created exclusion layer Shadow2DExclusion. This is a GovernExclusion that will create a shadow masked base on the predefined exclusion layers in the global mask.
• Incorporated Shadow2DExclusion into LaPDXYExclusion
  ~
• Added jupyter notebook for Shadow2DExclusion
• Updated notebook for LaPDXYExclusion
• Created a dedicated prototyping notebook directory docs/notebooks/prototypes/
  ~
• Add mask_resolution property to MBItem.
• Restricted dependency kiwisolver < 1.4.7 to make CI tests pass. kiwisolver is a matplotlib dependency, and not ours directly.
• Fixed a handful of syntax errors and misspellings.