[macros] Remove unused "element-like" macros.

Author: tkoeppe

source/macros.tex

@@ -341,11 +341,7 @@
 \newcommand{\replaceable}{\Fundesc{Replaceable}}
 \newcommand{\result}{\Fundesc{Result}}
 \newcommand{\returntype}{\Fundesc{Return type}}
-\newcommand{\cvalue}{\Fundesc{Value}}
 \newcommand{\ctype}{\Fundesc{Type}}
-\newcommand{\ctypes}{\Fundesc{Types}}
-\newcommand{\dtype}{\Fundesc{Default type}}
-\newcommand{\ctemplate}{\Fundesc{Class template}}
 \newcommand{\templalias}{\Fundesc{Alias template}}
 
 %% Cross reference