Update theme (bugfixes, support for frame subtitles)

demo.tex

@@ -307,6 +307,12 @@ int main() {
 
     To change the background color of the footer, simply use \verb|    \neoset{footer style=standout}|
 \end{frame}
+
+\begin{frame}[fragile]{Header icon}{with a frame subtitle}
+    Be cautious when mixing framtitel icons and frame subtitles.
+
+    If a frame subtitle is given for the current slide, the frametitle icon is replaced.
+\end{frame}
 }
 
 \begin{frame}{References}

theme @ d0ff7576

-Subproject commit d26ebbc3f1f7f81b9288f84502a7d26b379d8f49
+Subproject commit d0ff757632759a95ae82d326c0d0889d38a5f405