Refactor Include System

lilypond-custom-includes/categories.ily

@@ -0,0 +1,9 @@
+#(define category-names '(
+  (see "See und\nPiraten")
+  ;(categoriekey "Titel der Kategorie")
+  ))
+
+%% Path to Category images
+#(define-public (category-image-path category)
+   (string-append "../../liederbuecher/beispiel_liederbuch/categories/"
+         category ".eps"))