MODULE REMOVAL, SECURITY - Removed Log4J 1.x log adapter.

Github warns me that Log4J 1.x has a security issue (CVE-2019-17571
) with no updated version available (apparently EOL). I don't think the security issue affects our use of this module but I don't want a JAR with security issues in the build.

I also note this module code has incorrect logger names and I doubt anyone is using it.

Author: danfickle

openhtmltopdf-log4j/pom.xml

@@ -23,7 +23,6 @@
 
   <modules>
     <module>openhtmltopdf-core</module>
-    <module>openhtmltopdf-log4j</module>
     <module>openhtmltopdf-slf4j</module>
     <module>openhtmltopdf-examples</module>
     <module>openhtmltopdf-pdfbox</module>