[closed] Wie kann ich meinen Zitationsstil in die neue Biblatex-Version übersetzen?

\begin{filecontents*}{\jobname.bib}
@ONLINE{website,
  TITLE        = {Titel der Website},
  HOWPUBLISHED = {Website},
  URL          = {http://www.musterseite.de},
  URLDATE      = {2017-07-11},
}

@book{a,
  title = {Bsp. Titel},
  date = {2012},
  author = {Mustermax, Hans},
  location = {Berlin},
  publisher = {Musterverlag},
}

@article{b,
  title = {Musterarticle},
  pages = {{116--121}},
  number = {39},
  journaltitle = {Musterjurnal},
  author = {Musterautor, Hans and Peter, Lustig and Schulz, Mario and Maier, Marie},
  date = {2012},   
}
\end{filecontents*}

\documentclass [12pt,a4paper]{article}  
\usepackage{cmap}
\usepackage[utf8]{inputenc}             
\usepackage[ngerman]{babel}

%BIBLATEX
\usepackage[style=authoryear-icomp,backend=biber,url=false,isbn=false,maxnames=2,maxbibnames=8,minbibnames=8]{biblatex}
\addbibresource{\jobname.bib}% Hinzugefügt

\DeclareFieldFormat{pages}{#1}

\DeclareFieldFormat*{title}{\textit{#1}}
\DeclareFieldFormat*{citetitle}{\textit{#1}}
\DeclareFieldFormat*{journaltitle}{\textit{#1}}
\DeclareFieldFormat*{booktitle}{\textit{#1}}

\DeclareBibliographyDriver{incollection}{
    \usebibmacro{bibindex}
    \usebibmacro{begentry}
    \usebibmacro{author/translator+others}
    \setunit{\labelnamepunct}\newblock
    \usebibmacro{title}
    \newunit
    \printlist{language}
    \newunit\newblock
    \usebibmacro{byauthor}
    \newunit\newblock
    \usebibmacro{in:}
    \usebibmacro{editor}
    \setunit{\addcolon\space}
    \usebibmacro{maintitle+booktitle}
    \newunit\newblock
    \printfield{edition}
    \newunit
    \iffieldundef{maintitle}
    {\printfield{volume}
        \printfield{part}}
    {}
    \newunit
    \printfield{volumes}
    \newunit\newblock
    \usebibmacro{series+number}
    \newunit\newblock
    \newunit\newblock
    \usebibmacro{chapter+pages}
    \newunit\newblock
    \usebibmacro{publisher+location+date}
    \newunit\newblock
    \newunit\newblock
    \usebibmacro{doi+eprint+url}
    \newunit\newblock
    \usebibmacro{addendum+pubstate}
    \setunit{\bibpagerefpunct}\newblock
    \usebibmacro{finentry}
}

\renewbibmacro*{editor}{
    \ifnameundef{editor}
    {}
    {\printnames{editor}
        \usebibmacro{editorstrg}
        \clearname{editor}}}
\renewbibmacro*{editorstrg}{
    \iffieldundef{editortype}
    {\ifboolexpr{
            test {\ifnumgreater{\value{editor}}{1}}
            or
            test {\ifandothers{editor}}
        }
        {\addspace\mkbibparens{\bibstring{editors}}}
        {\addspace\mkbibparens{\bibstring{editor}}}}
    {\ifboolexpr{
            test {\ifnumgreater{\value{editor}}{1}}
            or
            test {\ifandothers{editor}}
        }
        {\addspace\mkbibparens{\bibstring{\thefield{editortype}s}}}
        {\addspace\mkbibparens{\bibstring{\thefield{editortype}}}}}
}

\DeclareFieldFormat{pagetotal}{ {} }

\DeclareFieldFormat{volumes}{ {} }

\DeclareNameFormat{default}{
  % siehe http://texwelt.de/wissen/fragen/16629
  \nameparts{#1}%
  \usebibmacro{name:last}
    {\namepartfamily}
    {\namepartgiven}
    {\namepartprefix}
    {\namepartsuffix}%
  \usebibmacro{name:andothers}%
}
\DeclareNameFormat{labelname}{
  % siehe http://texwelt.de/wissen/fragen/16629
  \nameparts{#1}%
  \usebibmacro{name:last}
    {\namepartfamily}
    {\namepartgiven}
    {\namepartprefix}
    {\namepartsuffix}%
  \usebibmacro{name:andothers}%
}

\DeclareNameFormat{sortname}{
  % siehe http://texwelt.de/wissen/fragen/16629
  \nameparts{#1}%
  \iffirstinits
  {%
    \usebibmacro{name:last}
      {\namepartfamily}
      {\namepartgiveni}
      {\namepartprefix}
      {\namepartsuffix}%
  }
  {%
    \usebibmacro{name:last}
      {\namepartfamily}
      {\namepartgiven}
      {\namepartprefix}
      {\namepartsuffix}%
  }%
  \usebibmacro{name:andothers}%
}

\let\oldmultinamedelim\multinamedelim
\let\oldfinalnamedelim\finalnamedelim
\renewcommand*{\multinamedelim}{,\space}
\renewcommand*{\finalnamedelim}{~\&\space}
\AtBeginBibliography{
    \renewcommand*{\multinamedelim}{\oldmultinamedelim}
    \renewcommand*{\finalnamedelim}{\oldfinalnamedelim}
}

\usepackage{xpatch}

\xpatchbibmacro{textcite}{
    {\usebibmacro{cite:label}
        \setunit{
            \global\booltrue{cbx:parens}
            \addspace\bibopenparen}
        \ifnumequal{\value{citecount}}{1}
        {\usebibmacro{prenote}}
        {}
        \ifthenelse{\ifciteibid\AND\NOT\iffirstonpage}
        {\usebibmacro{cite:ibid}}
        {\usebibmacro{cite:labelyear+extrayear}}}
}{
{\usebibmacro{cite:label}
    \setunit{
        \global\booltrue{cbx:parens}
        \addspace\bibopenparen}
    \ifnumequal{\value{citecount}}{1}
    {\usebibmacro{prenote}}
    {}
    \usebibmacro{cite:labelyear+extrayear}}
}{}{}

\xpatchbibmacro{textcite}{
    {\ifthenelse{\ifciteibid\AND\NOT\iffirstonpage}
        {\usebibmacro{cite:ibid}}
        {\usebibmacro{cite:labelyear+extrayear}}}
}{
{\usebibmacro{cite:labelyear+extrayear}}
}{}{}

%ENDE BIBLATEX

\begin{document}
Text. \cite{Website}. Ein weiteres Zitat \cite{a} oder auch \cite{b}.

\printbibliography
\end{document}