rework property handling

+ DataType validators are shifted to __call__
+ as_json is moved to export_datatape()
+ new HasProperties Base Mixin for Modules/DataTypes
+ accessibles can be accessed via iterator of a module
+ properties are properly 'derived' and checked, are set with .setPropertyValue

remember: parameters only have properties, so use getPropertyValue()

Change-Id: Iae0273f971aacb00fe6bf05e6a4d24a6d1be881a
Reviewed-on: https://forge.frm2.tum.de/review/20635
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/basic_validators.py

@@ -146,3 +146,10 @@ def TupleProperty(*checkers):
             return tuple(c(v) for c, v in zip(checkers, values))
         raise ValueError(u'Value needs %d elements!' % len(checkers))
     return TupleChecker
+
+def ListOfProperty(checker):
+    if not callable(checker):
+        raise ProgrammingError(u'ListOfProperty needs a basic validator as Argument!')
+    def ListOfChecker(values):
+        return [checker(v) for v in values]
+    return ListOfChecker