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/wild-rover.tex

@@ -0,0 +1,57 @@
+\begin{song}{
+  title = {Wild Rover},
+  lyrics = {traditionell},
+  composer = {traditionell},
+  bulibu = 344,
+  bulibull = 1,
+  cl = 94,
+  barde = 184,
+  libock = 194,
+}
+
+\begin{verse}
+I’ve \chord{D} been a wild rover for many a y \chord{G}ear, \\
+I s \chord{D}pend all my money on whi \chord{A}skey and beer. \\
+But now I’m returning with gold in great \chord{G}store \\
+and I \chord{D}never will play the wild r \chord{A}over no \chord{D}more.
+\end{verse}
+
+\begin{verse}
+And it’s n \chord{A}o, nay, never, no nay n \chord{D}ever no mo \chord{G}re \\
+will I \chord{D}play the wild \chord{G}rover no n \chord{D}ever, \chord{A}no \chord{D} more.
+\end{verse}
+
+\begin{verse}
+I went to an ale-house where I used to frequent, \\
+and I told the landlady my money was spent, \\
+I asked her for credit, she answered me nay, \\
+such a custom of yours I can have any day.
+\end{verse}
+
+\begin{verse}
+And it’s no, nay, never...
+\end{verse}
+
+\begin{verse}
+I took from my pocket, ten sovereigns bright, \\
+and the landlady’s eyes opened wide with delight. \\
+She said I have whiskey and wines of the best \\
+and the words that I said sure were only in jest.
+\end{verse}
+
+\begin{verse}
+And it’s no, nay, never...
+\end{verse}
+
+\begin{verse}
+I’ll go home to my parents, confess what I’ve done, \\
+I’ll ask them to pardon their prodigal son, \\
+and if they caress me as oft times before, \\
+then I never will play the wild rover no more.
+\end{verse}
+
+\begin{verse}
+And it’s no, nay, never…
+\end{verse}
+
+\end{song}