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>

songbook.tex

@@ -48,14 +48,7 @@ Herzlichst Gut Pfad
 \printsongtoc
 \clearpage
 
-% --- Filler images can be placed between songs ---
-% Example: \fillerpage{images/drawing.png}
-
-% --- Songs (alphabetical) ---
-\input{songs/abend-wird-es-wieder}
-\input{songs/auf-auf-zum-froehlichen-jagen}
-\input{songs/die-gedanken-sind-frei}
-\input{songs/hejo-spann-den-wagen-an}
-\input{songs/kein-schoener-land}
+% --- Songs (alphabetical, auto-generated from import) ---
+\input{all-songs}
 
 \end{document}