[TD] cleanup preferences

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

src/Mod/TechDraw/Gui/DlgPrefsTechDrawAnnotation.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>415</width>
+    <width>440</width>
     <height>447</height>
    </rect>
   </property>