[FEATURE] Create a new set of nested prefabs for menus

[japtar10101]

Is your feature request related to a problem? Please describe.

Menus.

Describe the solution you'd like

Create a set of nested prefabs for setting up all menus. In addition, create sets of prefabs in example scenes (both start and levels) for arcade games with only one level and a high score system, and other games that has multiple levels (and potentially high scores).

Tasklist

• Fix issue [BUG] Menu prefabs are not linked correctly. #13 - Menu Prefabs not working properly.
• Evaluate which "large" menus needs more nesting.
• Design a prefab structure that makes it easy to add more custom menus to.

Describe alternatives you've considered

Scripts dynamically adding menus to the current one.

Additional context

Carry-over from the old Bitbucket Mercurial project:
https://bitbucket.org/OmiyaGames/hg-template-unity-project/issues/62/create-a-new-set-of-nested-prefabs-for

[japtar10101]

Note that technically, this task is mostly complete: I do, however, want to revisit this task again, this time on splitting up the Options menu, especially after re-writing how the game stores its saves data.