use friendlier package

--- a/src/Doc/Datatypes/document/root.tex	Thu Apr 16 18:41:09 2020 +0200
+++ b/src/Doc/Datatypes/document/root.tex	Fri Apr 17 17:19:41 2020 +0200
@@ -17,7 +17,7 @@
 \usepackage{pdfsetup}
 \usepackage{railsetup}
 \usepackage{framed}
-\usepackage{regexpatch}
+\usepackage{xpatch}
 
 \makeatletter
 \xpatchcmd{\chaptermark}{\MakeUppercase}{}{}{}%