LaTeX: enhanced boxes with padding, borders, shadows, rounded corners

- LaTeX: box padding (t,r,b,l), borders (t,r,b,l), shadows (x,y) or radii

- LaTeX: fix #10650 via usage of our own sophisticated \fcolorbox

- LaTeX: user interface via 'sphinxsetup' to enhanced code-blocks frames

- LaTeX: user interface via 'sphinxsetup' to enhanced topic boxes

- LaTeX: CSS-named-alikes 'sphinxsetup' options for code-blocks and
  topics

- LaTeX: CSS-named-alikes 'sphinxsetup' keys for warning type notices
  (fix #10651)

- LaTeX: documentation of the new CSS-like options

- LaTeX: remove #10619 documentation, as the #10619 added
  shadowBorderColor and shadowShadowColor now named respectively:

  aside.topic_border-TeXcolor and aside.topic_box-shadow-TeXcolor

- LaTeX: use div.topic option prefix and not aside.topic for CSS-like
  options

- LaTeX: keep the implicit legacy padding of warning type boxes as
  default behaviour

doc/conf.py

@@ -77,7 +77,8 @@
     'sphinxsetup': """%
 VerbatimColor={RGB}{242,242,242},%
 VerbatimBorderColor={RGB}{32,32,32},%
-verbatimradius=3pt%
+pre_border-radius=3pt,%
+pre_box-decoration-break=slice,%
 """,
 }
 latex_show_urls = 'footnote'