Is the base class of "transport" classes which carry one named value, these classes are used to send custom data from client
to server using an event fired on the client and listened in the server.
Derived classes may do some kind of automatic synchronization in the server, for instance
an attribute of a client element can be transported and updated the server counterpart element.
SingleParamTransport(String name, boolean sync) Creates a new instance ready to transport a client value with the specified name
with optional server synchronization.
Parameters: name - the attribute name.
Creates a new instance ready to transport a client value with the specified name
with optional server synchronization.
Parameters: name - the attribute name. Parameters: sync - if true the server attribute is updated.