Add new lean configuration parameter:

com.openexchange.passwordchange.script.base64
description: Indicates if the string based script parameters like username,
oldpassword and newpassword should be encoded as Base64 to circumvent character encoding issues on improperly configured distributions not providing an unicode environment for the process.
defaultValue: false
reloadable: true
configcascadeAware: false
related: com.openexchange.passwordchange.script.shellscript
file: change_pwd_script.properties