[styles] Redesign Annex titles per Rice Model Standard

Fixes ISO/CS comment (C++23 proof)

Author: jensmaurer

source/std.tex

@@ -137,6 +137,7 @@
 %%--------------------------------------------------
 %% appendices
 \appendix
+\chapterstyle{cppannex}
 
 % \include and \addtocontents don't mix; see
 % https://tex.stackexchange.com/questions/13914/toc-numbering-problem

source/styles.tex

@@ -5,18 +5,28 @@
 %     footnotes
 
 %%--------------------------------------------------
-%%  create chapter style
+%%  create chapter styles
 
 \makechapterstyle{cppstd}{%
-  \renewcommand{\beforechapskip}{\onelineskip}
-  \renewcommand{\afterchapskip}{\onelineskip}
+  \setlength{\beforechapskip}{\onelineskip}
+  \setlength{\afterchapskip}{\onelineskip}
   \renewcommand{\chapternamenum}{}
   \renewcommand{\chapnamefont}{\chaptitlefont}
   \renewcommand{\chapnumfont}{\chaptitlefont}
   \renewcommand{\printchapternum}{\chapnumfont\thechapter\quad}
   \renewcommand{\afterchapternum}{}
 }
 
+\makechapterstyle{cppannex}{%
+  \setlength{\beforechapskip}{\onelineskip}
+  \setlength{\afterchapskip}{\onelineskip}
+  \renewcommand{\chapternamenum}{}
+  \renewcommand{\chapnamefont}{\chaptitlefont}
+  \renewcommand{\chapnumfont}{\chaptitlefont}
+  \renewcommand{\printchapternum}{\chapnumfont\centering\thechapter\protect\\}
+  \renewcommand{\afterchapternum}{}
+}
+
 %%--------------------------------------------------
 %%  create page styles
 
@@ -86,7 +96,7 @@
 
 %%--------------------------------------------------
 % set heading style for annexes
-\newcommand{\Annex}[3]{\chapter[#2]{(#3)\protect\\#2\hfill[#1]}\relax\annexlabel{#1}}
+\newcommand{\Annex}[3]{\chapter[#2]{\textnormal{(#3)}\protect\\[3ex]#2\hfill[#1]}\relax\annexlabel{#1}}
 \newcommand{\infannex}[2]{\addxref{#1}\Annex{#1}{#2}{informative}}
 \newcommand{\normannex}[2]{\addxref{#1}\Annex{#1}{#2}{normative}}