This PR improves the behavior of the Draft grid:
* Options in the preferences: "Always show the grid" and "Show the grid during commands".
* The parameters are used for new views. In existing views the grid can be toggled either during a command or when no command is active.
* When switching to a different workbench all grids are hidden unless GridHideInOtherWorkbenches is set to `False`. This can be a Fine-tuning parameter IMO.
Notes:
* The defaultCameraHeight parameter becomes obsolete. It was only used in very specific circumstances.
* The code of PR #8818 becomes obsolete. It makes more sense to use `App.activeDraftCommand` instead of adding a `tool` argument to some functions. Will do some related cleanup later.
* Improved alignment for the related preference ui. The checkbox interaction has been fixed as well.
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