* [TD]Add view snapping preferences
* [TD]fix section snapping algo
- snap sections to section normal line.
- snap views to other views in X&Y
* [TD]fix snapping to ProjectionGroups
QT treats setting minimum size very seriously - it applies even if
the size required by the control is smaller than specified resulting in
rendering too small controls.
- section line convention label
- remove superfluous save/restore on changeEvent
- change default scrub count
- add preference for default symbol dir
- add preference for display of section cut line
as discussed here: https://forum.freecadweb.org/viewtopic.php?f=35&t=53680&p=461356#p461349
* change default tolerance scale to 0.8
* the tolerance scale is directly applied, thus it must have non-italic label
* move tolerance scale to "Dimensions" tab
* move Fuzz settings to "Advanced" tab
* move Conventions to General tab since e.g. the projection angle is an important general setting
* add a note for the label font that this is also used for dimensions and that it there only has an effect for new ones
* use more useful step size of 0.1 for some scaling spinboxes
* sort UI fields in the C++ code to avoid doubled or missing entries (there were 2 doubled entries)
* uniform width of all preferences dialogs
* better alignment for the HLR dialog
this is unnecessary since Qt will automatically use the available font. It only raises questions since one see in the commit diffs that depending on who modified the dialog, his system default font will appear. (like in the initial commit of this PR)
- I had a look at Crowdin and saw that the translators don't know what to do with the uppercase letter words. And in fact we can use "normal" terms
- I also fixed a typo (missing 'd') to be consistent
