- allow syntax "object,type=::SomeClass" and "class,type=::SomeMetaClass" (currently identical, we should as well check for class/meta-class in case of "class,type=SomeClass")
- support for parameter spec of form "type=XXX" to denote that the parameter must be an object of the specified type (class; directly or indirectly) - new built-in converter: convertToObjectOfType() - keep parameterObj (source for conversion to XOTclParam) for making introspection less work. However, this is only used for XOTclParams generated via ParamParse(). - extending regression test