Import 294 songs from Carmina Leonis PDF

Add import-songs.py script that extracts songs from the PDF text
and generates .tex files with leadsheets format. Adds song
properties for all reference books (BuLiBu, BuLiBuII, CL, SwA,
Barde, LiBock). Generates all-songs.tex with alphabetical inputs.

Note: Chord alignment is approximate from PDF extraction and
may need manual review for some songs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

songs/oh-fischer.tex

@@ -0,0 +1,42 @@
+\begin{song}{
+  title = {Oh Fischer},
+  lyrics = {aus Korsika},
+  composer = {aus Korsika},
+  bulibull = 2,
+  cl = 73,
+}
+
+\begin{verse}
+/:Oh F \chord{D}ischer, a \chord{A}uf den Wo \chord{D}gen, oh Federi. :/ \\
+/: Ach k \chord{G}omm in deinem Kahn \chord{D}, colla tua bella b \chord{A}arca, \\
+tua bella sene \chord{D}va, federi \chord{A}l \chord{D}inla. :/
+\end{verse}
+
+\begin{verse}
+Oh Fischer, hol mein Ringlein, oh Federi! \\
+/: Es fiel ins tiefe Meer, colla tua bella… :/
+\end{verse}
+
+\begin{verse}
+Das Ringlein ist gefunden, von Federi. \\
+/: Was gibst du mir als Lohn? Colla tua bella… :/
+\end{verse}
+
+\begin{verse}
+Ich geb dir hundert Taler, oh Federi. \\
+/: Den Beutel noch dazu, colla tua bella… :/
+\end{verse}
+
+\begin{verse}
+Was nützen mir die Taler, oh Federi? \\
+/: Behalt auch deinen Beutel, colla tua bella… :/
+\end{verse}
+
+\begin{verse}
+Mein Wunsch, darf ich es \\
+wagen, dein Federi? \\
+/: Zieh mit mir in die Welt, \\
+colla tua bella… :/
+\end{verse}
+
+\end{song}