Language injection

[PHPirates]

Part of #101

Summary of additions and changes

• Add intention to insert magic comment
• When magic comment or language option of lstlisting is used, inject language

How to test this pull request

\begin{lstlisting}[language=Kotlin,label={lst:lstlisting}]
fun Int?.ifPositiveAddTwo(): Int =
        this?.let {
        if (this >= 0) this + 2
            else this
} ?: 0
\end{lstlisting}

Wiki

• Updated the wiki: