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/fields-of-athenry.tex

@@ -0,0 +1,64 @@
+\begin{song}{
+  title = {Fields of Athenry},
+  lyrics = {traditionell},
+  composer = {Pete St. John, 1979},
+  cl = 52,
+  libock = 42,
+}
+
+\begin{verse}
+By a l \chord{D}onely prison wall, \\
+I h \chord{G}eard a young girl c \chord{D}al \chord{A}ling: \\
+Mi \chord{D}chael, they have t \chord{G}aken you away \chord{A}, \\
+for you st \chord{D}ole Trevelyn's co \chord{G}rn, \\
+so the yo \chord{D}ung might see the morn \chord{A}. \\
+Now a prison ship lies waiting in the b \chord{D}ay.
+\end{verse}
+
+\begin{verse}
+Ref.:
+\end{verse}
+
+\begin{verse}
+L \chord{D}ow \chord{G} lie the Fi \chord{D}elds of Athenry \\
+where once \chord{D} we watched the small free birds fl \chord{A}y. \\
+Our lo \chord{D}ve was on the wing \chord{G}, we had dreams \chord{D} and \\
+songs to sin \chord{A}g, \\
+it's so lonely 'round the Fields of Athenr \chord{D}y.
+\end{verse}
+
+\begin{verse}
+By a lonely prison wall, \\
+I heard a young man calling: \\
+Nothing matters, Mary, when you're free \\
+against the famine and the crown, \\
+I rebelled, they cut me down. \\
+Now you must raise our child with dignity.
+\end{verse}
+
+\begin{verse}
+By a lonely harbour wall, \\
+she watched the last star falling. \\
+As that prison ship sailed out against the sky, \\
+sure she'll wait and hope and pray, \\
+for her love in Botany Bay. \\
+It's so lonely 'round the Fields of Athenry.
+\end{verse}
+
+\begin{verse}
+The Fields of Athenry ist ein Lied über die Irische \\
+Hungersnot zwischen 1846 und 1849, von der auch \\
+die Bewohner der Stadt Athenry betroffen waren. \\
+Pete St. John, der in vielen Quellen als Textschöpfer \\
+genannt wird, änderte lediglich wenige Worte einer \\
+irischen Ballade aus den 1880er Jahren und fügte die \\
+Melodie in den 1970er Jahren hinzu. \\
+Das Lied erzählt von einem Mann, \\
+der, um seine Familie vor \\
+dem Hungerstod zu retten, \\
+Getreide stiehlt und \\
+dafür nach Australien \\
+(Botany Bay) deportiert wird.
+\end{verse}
+
+\end{song}