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/miners-song.tex

@@ -0,0 +1,37 @@
+\begin{song}{
+  title = {Miners Song},
+  lyrics = {Colin Wilkie},
+  composer = {Colin Wilkie},
+  cl = 261,
+  libock = 268,
+}
+
+\begin{verse}
+N \chord{a}o you won’t get me down underground in your \chord{G} mines, \\
+Aw \chord{F}ay from the tr \chord{C}ees and the fl \chord{G}owers so fi \chord{C}ne. \\
+D \chord{F}own in the d \chord{C}ark where the s \chord{G}un never sh \chord{E}in \chord{E7}es. \\
+No you wo \chord{a}n’t get me do \chord{G}wn in your mine \chord{a}s.
+\end{verse}
+
+\begin{verse}
+They work in the dark for the most of their lives, \\
+Away from the children, away from their wives. \\
+To make others rich, in the heat and the dark. \\
+But who’s going to care when you’re too old to work?
+\end{verse}
+
+\begin{verse}
+There’s many a miner has died underground. \\
+Died all alone when the roof tumbled down. \\
+Or choked out his life underneath the great beams. \\
+Or buried and gassed in that lousy coal-seam.
+\end{verse}
+
+\begin{verse}
+I’ve worked in your factories, I’ve worked on your farms, \\
+Until all the muscles stood out on my arms \\
+I’ve been in your armies and I’ve been out to sea. \\
+But by Christ you won’t make a coal-miner of me.
+\end{verse}
+
+\end{song}