Move the rest of the plugin annotations.

  - All the @PluginFoo annotations are now housed in the 
  log4j-plugin-processor module.
  - log4j-core already depends on this :)

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1588809 13f79535-47bb-0310-9956-ffa450edef68