feature implementation

implement features including two proposed features
HasOffset and HasLimits

Change-Id: I7949f12dc8abe28fb2ee040e64e7db19d1b23b9a
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/28485
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

test/test_modules.py

@@ -235,7 +235,7 @@ def test_ModuleMagic():
     assert o2.parameters['a1'].datatype.unit == 'mm/s'
     cfg = Newclass2.configurables
     assert set(cfg.keys()) == {
-        'export', 'group', 'description', 'disable_value_range_check',
+        'export', 'group', 'description', 'disable_value_range_check', 'features',
         'meaning', 'visibility', 'implementation', 'interface_classes', 'target', 'stop',
         'status', 'param1', 'param2', 'cmd', 'a2', 'pollinterval', 'slowinterval', 'b2',
         'cmd2', 'value', 'a1'}