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/how-many-roads-blowin-in-the-wind.tex

@@ -0,0 +1,43 @@
+\begin{song}{
+  title = {How many roads (Blowin’ in the wind)},
+  lyrics = {Bob Dylan},
+  composer = {Bob Dylan},
+  bulibull = 1,
+  cl = 88,
+  libock = 186,
+}
+
+\begin{verse}
+\chord{C}How many r \chord{F}oads must a m \chord{C}an \chord{e} walk d \chord{a}own, \\
+bef \chord{C}ore you can c \chord{F}all him a m \chord{G}an \chord{G7}? \\
+Yes, ’n h \chord{C}ow many se \chord{F}as must a w \chord{C}hite d \chord{e}ove s \chord{a}ail, \\
+bef \chord{C}ore she can sle \chord{F}ep in the s \chord{G}an \chord{G7}d? \\
+Yes, ’n h \chord{C}ow many \chord{F}times must the c \chord{C}an \chord{e}nonballs f \chord{a}ly, \\
+bef \chord{C}ore they are f \chord{F}orever b \chord{G}anned?
+\end{verse}
+
+\begin{verse}
+Ref.: \\
+The a \chord{d}nswer my f \chord{G7}riend, is bl \chord{C}owin’ in the wi \chord{a}nd \\
+the a \chord{d}nswer is bl \chord{G7}owin’ in the w \chord{C}ind.
+\end{verse}
+
+\begin{verse}
+How many times must a man look up, \\
+before he can see the sky? \\
+Yes, ’n how many ears must one man have, \\
+before he can hear people cry? \\
+Yes, 'n how many deaths will it take till he knows, \\
+that too many people have died?
+\end{verse}
+
+\begin{verse}
+How many years can a mountain exist, \\
+before it's washed to the sea? \\
+Yes, 'n how many years can some people exist, \\
+before they're allowed to be free? \\
+Yes, 'n how many times can a man turn his head, \\
+pretending he just doesn't see?
+\end{verse}
+
+\end{song}