GM notes can now include arbitrary additional sections as attributes.

dungeonsheets/forms/dungeonsheets_epub.css

@@ -7,6 +7,7 @@ h1, h2, h3, h4, h5, h6 {
 body {
     /* background: #f4ecdb; */
     background-image: url("../images/paper.jpg");
+    background-size: 100%;
 }
 table {
     /* background: #ECEEE3; */

dungeonsheets/forms/extra_gm_content.html

@@ -0,0 +1,3 @@
+<h1 id="[[ title | to_heading_id ]]">[[ title ]]</h1>
+
+[[ rst | rst_to_html ]]

dungeonsheets/forms/extra_gm_content.tex

@@ -0,0 +1,4 @@
+\pdfbookmark[0]{[[ title ]]}{[[ title ]]}
+\section*{[[ title ]]}
+
+[[ rst | rst_to_latex ]]