52 modularized build script into functions and added possibility to have markdown appendices

appendix/01_example.tex

@@ -1,4 +0,0 @@
-%!TEX root = ../main.tex
-
-\section{Example}
-\label{app:example}

appendix/appendix.tex

@@ -1,5 +1,7 @@
 %!TEX root = ../main.tex
 
 % input the appendix files here like this:
-\input{appendix/01_example.tex}
-\newpage
+% \input{appendix/01_example.tex}
+% \newpage
+% when using markdown based appendices, they'll be generated to appendix/generated/${filename}.tex
+% appendices need to be \sections!