make colors user adjustable. expose hidden options.

- Systematize colors and make them user adjustable. See documentation for details.
  this requires the \moderncvcolor to be issued BEFORE \moderncvstyle.
- all styles: make the head options 'details' and 'nodetails' available to the user.
(previously they were hidden). Olystyle does not respond too well to nodetails.

moderncvstyleoldstyle.sty

@@ -12,13 +12,20 @@
 \NeedsTeXFormat{LaTeX2e}
 \ProvidesPackage{moderncvstyleoldstyle}[2021/01/21 v2.1.0 modern curriculum vitae and letter style scheme: oldstyle]
 
+% headoptions
+\@initializecommand{\moderncvstyleheadoptions}{}
+\@initializeif{\if@datainhead}\@datainheadtrue
+\DeclareOption{details}{\edef\moderncvstyleheadoptions{\moderncvstyleheadoptions,details}}
+\DeclareOption{nodetails}{\@datainheadfalse\edef\moderncvstyleheadoptions{\moderncvstyleheadoptions,nodetails}}
+
+
 % toggle use of symbol fonts.
 \@initializeif{\if@symbols}\@symbolsfalse
 \DeclareOption{symbols}      {\@symbolstrue}
 \DeclareOption{nosymbols}    {\@symbolsfalse}
 
 \DeclareOption*{}% avoid choking on unknown options
-\ExecuteOptions{symbols}
+\ExecuteOptions{symbols,details}
 \ProcessOptions*\relax% \ProcessOptions* processes the options in the order provided (i.e., with the later ones possibly overriding the former ones), while \ProcessOptions processes them in the order of the package
 
 %-------------------------------------------------------------------------------
@@ -50,12 +57,42 @@
 \fi
 
 
+%-------------------------------------------------------------------------------
+%               Colors
+%-------------------------------------------------------------------------------
+% head and footer
+\colorlet{lastnamecolor}{color2}
+\colorlet{namecolor}{lastnamecolor}
+\colorlet{headrulecolor}{lastnamecolor!50}
+\colorlet{firstnamecolor}{lastnamecolor!50}
+\colorlet{titlecolor}{color2}
+\colorlet{addresscolor}{color2}
+\colorlet{quotecolor}{color1}
+\colorlet{pictureframecolor}{color1}
+% body
+\colorlet{bodyrulecolor}{color1}
+\colorlet{sectioncolor}{color1}
+\colorlet{subsectioncolor}{color1}
+\colorlet{hintstylecolor}{color0}
+% letter
+\colorlet{letterclosingcolor}{color2}
+% skillmatrix
+\colorlet{skillmatrixfullcolor}{color1}
+\colorlet{skillmatrixemptycolor}{color2!30}
+
+
 %-------------------------------------------------------------------------------
 %                header, body & footer
 %-------------------------------------------------------------------------------
-\moderncvhead{4}
+\moderncvhead[\moderncvstyleheadoptions]{4}
 \moderncvbody{4}
-
+% include foot only if nodetails option is active since otherwise we have two times the information 
+% on the page
+\if@datainhead
+% if data is shown in head, do not include the footer
+\else
+  \moderncvfoot{1}
+\fi
 
 \endinput