Fixed AR-435: Added system bootstrap and shutdown hooks for native executables

- See the RuntimeExecBeansTest-context.xml for examples of how to put these together
 - Shutdown hooks are executed on ApplicationContext shutdown or VM shutdown, whichever is first
Moved native executable error code detection into RuntimeExec class
 - This affects any existing RuntimeExecContentTransformers (e.g. TidyTransformer)
Made OS search use regular expressions
 - Command search order is: Exact name, First matching REGEX, *
 - Note that * is a special case for 'default'.  The REGEX equivalent is .*

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2448 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

config/alfresco/content-services-context.xml

@@ -211,7 +211,7 @@
                     <entry key="Linux">
                         <value>imconvert ${source} ${options} ${target}</value>
                     </entry>
-                    <entry key="*">
+                    <entry key=".*">
                         <value>imconvert "${source}" ${options} "${target}"</value>
                     </entry>
                 </map>

config/alfresco/messages/content-service.properties

@@ -1,3 +1,4 @@
 # Content-related messages
 
 content.content_missing=The node''s content is missing: \n   node: {0} \n   reader: {1}  \n   Please contact your system administrator.
+content.runtime_exec.property_moved=The property ''errorCodes'' has moved down onto the RuntimeExec class