Add influences property to parameters/commands

Change-Id: Ica1cc40155cae9b6f52788c8559399030c07d379
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/31234
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>

test/test_modules.py

@@ -245,7 +245,7 @@ def test_ModuleMagic():
         'group', 'export', 'relative_resolution',
         'visibility', 'unit', 'default', 'value', 'datatype', 'fmtstr',
         'absolute_resolution', 'max', 'min', 'readonly', 'constant',
-        'description', 'needscfg', 'update_unchanged'}
+        'description', 'needscfg', 'update_unchanged', 'influences'}
 
     # check on the level of classes
     # this checks Newclass1 too, as it is inherited by Newclass2