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/scarborough-fair.tex

@@ -0,0 +1,42 @@
+\begin{song}{
+  title = {Scarborough fair},
+  lyrics = {englisches Traditional 16. oder 17. Jahrhundert},
+  composer = {überlieferte Melodie aus dem 19. Jahrhundert},
+  cl = 38,
+  barde = 25,
+  libock = 28,
+}
+
+% Der Name lässt sich auf das Mittelalter zurückführen, als die englische Stadt
+% Scarborough ein wichtiger Treffpunkt für Kaufleute aus ganz England war. Am
+% 15. August jedes Jahres startete dort eine 45-tägige große Handelsmesse, ge-
+% nannt Scarborough Fair, die für damalige Verhältnisse recht lang war.
+
+\begin{verse}
+\chord{a}Are you going to Scarb \chord{G}orough fair \chord{a}? \chord{C}/ Parsley, Sage, \\
+Rosma \chord{C}ry \chord{D} and Thyme. / \chord{a} Remember me to on \chord{C}e who \\
+l \chord{a}ives th \chord{G}ere, / for sh \chord{a}e once \chord{G} was a true love of \chord{a}mine.
+\end{verse}
+
+\begin{verse}
+Tell her to make me a cambic shirt, \\
+Parsley, Sage, Rosmary and Thyme. \\
+Without any seam or fine needlework \\
+and then she’ll be a true love of mine.
+\end{verse}
+
+\begin{verse}
+Tell her to buy me an acre of land, \\
+Parsley, Sage, Rosmary and Thyme. \\
+Between the sea foam and the sea sand, \\
+and then she´ll be a true love of mine.
+\end{verse}
+
+\begin{verse}
+Are you going to Scarborough fair? \\
+Parsley, Sage, Rosmary and Thyme. \\
+Remember me to one who lives there, \\
+for she once was a true love of mine.
+\end{verse}
+
+\end{song}