rgb and cmyk versions in one document

- separate colors.tex, to include from any sub-document
- provide both rgb and cmyk versions
- use rgb by default, \def\colormodel{cmyk} for clean print version
- make timetable.sty work with all color specifications:
- new \defineeventcolors accepts 5 arguments: name, bg colorformat, bg color values, fg format, fg values
- new \leteventcolors accepts 3 arguments: name, name of previously defined color for bg, name of color for fg

ESE 21 red CMYK version very VAGUELY approximated by a non-professional

timetable/zeitplan.tex

@@ -2,6 +2,7 @@
 \usepackage[default]{opensans}
 \usepackage[margin=0.55cm,landscape]{geometry}
 % \usepackage[height=25cm]{geometry}
+\usepackage{xcolor}
 \usepackage{timetable}
 \usepackage{transparent}
 \usepackage{amssymb}
@@ -9,6 +10,8 @@
 \usepackage{pifont}
 \newcommand{\wontfix}{\rlap{$\square$}{\large\hspace{1pt}\xmark}}
 
+\input{../colors.tex}
+
 \begin{document}
 \thispagestyle{empty}
 % \begin{landscape}
@@ -33,6 +36,9 @@
 \defineevent{other}{0.0}{0.47}{0.3}{1.0}{1.0}{1.0}% dunkelgrün
 \defineevent{extern}{0.77}{0.56}{0.05}{1.0}{1.0}{1.0}
 \defineevent{stream}{0.09}{0.45}{0.56}{1.0}{1.0}{1.0}% petrol
+\leteventcolors{ese}%
+  {ese_bg_color}
+  {ese_fg_color}
 
 % Start the timetable
 \begin{center}