Feat: skeleton to create new sequence

tools/skeleton/sequence/B1.tex

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+\documentclass[a4paper,10pt]{article}
+\usepackage{myXsim}
+
+\author{\Var{ author }}
+\title{\Var{title} - Cours}
+\date{\Var{date.strftime("%B %Y")}
+
+\pagestyle{empty}
+
+\begin{document}
+
+\maketitle
+
+\end{document}

tools/skeleton/sequence/E1.tex

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+\documentclass[a4paper,10pt]{article}
+\usepackage{myXsym}
+
+\author{\Var{ author }}
+\title{\Var{title} - Cours}
+\date{\Var{date.strftime("%B %Y")}
+
+\DeclareExerciseCollection{banque}
+\xsimsetup{
+    step=1,
+}
+
+\begin{document}
+
+\input{exercises.tex}
+\printcollection{banque}
+
+\end{document}

tools/skeleton/sequence/exercises.tex

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+\collectexercises{banque}
+\begin{exercise}[subtitle={<++>}, step={1}, origin={<++>}, topics={\Var{title}}, tags={\Var{tags}}]
+    <++>
+\end{exercise}
+
+\begin{solution}
+    <++>
+\end{solution}
+
+\collectexercisesstop{banque}

tools/skeleton/sequence/index.rst

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+{{ title }}
+{{ title_under }}
+
+:date: 2020-08-14
+:modified: 2020-08-14
+:authors: {{ author }}
+:tags: {{ tags }}
+:category: {{ tribe }}
+:summary: {{ summary }}
+
+Étape 1:
+========