[TD] some fixes

- the setting "Standard and Style" only affects new dimensions, thus it must be italic

- fix bug that the Property 'LockPosition' appears for dimensions -> this is an option for views and thus must be hidden for dimensions

- since tolerances are in the vast majority fractions of a millimeter/inch, set its stepsize to 0.1
(I hope I did it right in handleChangedPropertyType.)

- fix inconsistent newlines in TaskBalloon.h

- improve wording for a heading

src/Mod/TechDraw/Gui/DlgPrefsTechDrawDimensions.ui

@@ -111,6 +111,11 @@
             <height>0</height>
            </size>
           </property>
+          <property name="font">
+           <font>
+            <italic>true</italic>
+           </font>
+          </property>
           <property name="text">
            <string>Standard and Style</string>
           </property>