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.
Related issue:
#5603.
For gui_snapper.py and gui_trackers.py an intermediate solution has been adopted. They still rely on App.DraftWorkingPlane, but now use a small function to retreive it.
Simply switching to the PlaneGui class is problematic for the trackers as this results in an endless recursion (wp->grid->wp->...). Using the old App.DraftWorkingPlane (which is kept up-to-date by PlaneGui) solves this for now. I will try to return to this later (which may be after the next release though).
Forum topic:
https://forum.freecad.org/viewtopic.php?t=81956
This PR basically reverts PR #10556.
The angular offset required for the Draft_Arc command is handled in the gui_arc.py file instead. Also removed the unused `urotated` variable from that file.
Steps to verify the issue:
1. Open FreeCAD.
2. Switch to Std_ViewTop.
3. Click one of the curved arrows of the Navigation Cube.
4. Switch to the Draft WB.
5. Make sure Draft_SelectPlane is set to "Auto".
6. Start Draft_Arc and click 2 points (for the radius and the start angle).
7. Result: The displayed arc does not match the start angle or the current point.
Additonally:
* Removed the normal argument from `__init__`. The tracker does not work properly with just a normal. AFAICT there is no code that specifies this normal.
* Minor improvement to `getAngle`: Switched the vectors.
- If grid is on and auto grid on: Grid always appears
- If grid is on and auto grid off: Grid off at start, on when using a tool, off afterwards
- If grid is off: Grid never appears
If the grid spacing was updated in this sequence: 1 -> 0 -> 1 (or any sequence where the first and last value are equal), the grid would not be redrawn.
Display the human figure at the grid corner.
The silhouette is displayed only if:
- BIM Workbench is available;
- preference BaseApp/Preferences/Mod/Draft/gridShowHuman is True;
- the working plane normal is vertical.
Small spacing fixes like imports in separate lines
for more clarity, and the position of the license.
Also use the `ToDo` class with this new name
following Python guidelines.
Properly import the tracker classes. Avoid star imports,
and use the classes prefixed with the name of the module.
The BIM Workbench also has to be updated to use the new
module.
```
import draftguitools.gui_trackers as DraftTrackers
```
