Add maintenance makefile rule and XSLT transform to generate a unified header of all library functions for analysis purposes.

Maintenance/lufa_functionlist_transform.xslt

@@ -0,0 +1,19 @@
+<!--
+             LUFA Library
+     Copyright (C) Dean Camera, 2013.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+-->
+
+<!-- Extracts out all function signatures from a combined Doxygen XML output. -->
+
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
+	<xsl:output method="xml" omit-xml-declaration="yes"/>
+
+	<xsl:template match="doxygen">
+		<xsl:for-each select="//memberdef[@kind = 'function']">
+			<xsl:value-of select="definition"/><xsl:value-of select="argsstring"/><xsl:text>;&#10;</xsl:text>
+		</xsl:for-each>
+	</xsl:template>
+</xsl:stylesheet>