Fix binary metadata writing escaping

 <extension target="org.nuxeo.binary.metadata"
            point="metadataMappings">
   <!-- Define "processor" to use and specify the attached binary's xpath ("blobXPath") -->
   <!-- Technical "id" should be unique  -->
   <!-- "ignorePrefix" is by default set to true. Here metadata have prefixes, so set it to false. -->
   <metadataMapping id="Example" processor="exifTool" blobXPath="file:content" ignorePrefix="false">
     <!-- "name" = binary metadata  , "xpath" = document metadata -->
     <!-- See PDF metadata extraction example in this page -->
     <metadata name="PDF:Producer" xpath="dc:title"/>
     <metadata name="PDF:Author" xpath="dc:description"/>
   </metadataMapping>
</extension>

<!-- Define which mappings will be called by the listener, and under which conditions -->
<extension target="org.nuxeo.binary.metadata"
            point="metadataRules">
  <!-- "order" = priority , "async" = listener mode (set "true" to apply mapping as background work) -->
  <!-- Technical "id" should be unique  -->
  <rule id="default" order="0" enabled="true" async="false">
     <metadataMappings>
       <metadataMapping-id>Example</metadataMapping-id>


     </metadataMappings>
     <!-- see the link below for filter contributions -->
     <filters>
       <filter-id>hasFileType</filter-id>

     </filters>
   </rule>
 </extension>
 
 <extension target="org.nuxeo.ecm.platform.actions.ActionService"
            point="filters">
   <filter id="hasFileType">
     <rule grant="true">
       <type>File</type>
     </rule>
   </filter>
 </extension>

14:41:24,708 ERROR [EventServiceImpl] Exception during binaryMetadataSyncListener sync listener execution, continuing to run other listeners
java.lang.IllegalArgumentException: '-PDF:Producer=nuxeo_search_stats_demos -PDF:Author=Something\ else\ that\ "makes\ no\ sense"\ :-) ' contains illegal characters. It should match: [\p{L}_0-9-.%:=/\\ ]+
	at org.nuxeo.ecm.platform.commandline.executor.service.CommandLineExecutorComponent.checkParameter(CommandLineExecutorComponent.java:214)
	at org.nuxeo.ecm.platform.commandline.executor.service.executors.AbstractExecutor.replaceParams(AbstractExecutor.java:94)
	at org.nuxeo.ecm.platform.commandline.executor.service.executors.AbstractExecutor.getParametersString(AbstractExecutor.java:65)
	at org.nuxeo.ecm.platform.commandline.executor.service.executors.ShellExecutor.exec(ShellExecutor.java:59)
	at org.nuxeo.ecm.platform.commandline.executor.service.CommandLineExecutorComponent.execCommand(CommandLineExecutorComponent.java:157)
	at org.nuxeo.binary.metadata.internals.ExifToolProcessor.writeMetadata(ExifToolProcessor.java:94)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.writeMetadata(BinaryMetadataServiceImpl.java:148)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.handleUpdate(BinaryMetadataServiceImpl.java:251)
	at org.nuxeo.binary.metadata.internals.BinaryMetadataServiceImpl.handleSyncUpdate(BinaryMetadataServiceImpl.java:227)
	at org.nuxeo.binary.metadata.internals.listeners.BinaryMetadataSyncListener.handleEvent(BinaryMetadataSyncListener.java:57)