* Remove dependency of <loadproperties> on StringInputStream
* Modify StringInputStream to support encoding
* Note that StringInputStream is not being used by any other Ant classes - the sole consumer was LoadProperties which no longer uses it.
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@273132 13f79535-47bb-0310-9956-ffa450edef68