revert default of poll to False

Before the introduction of the Property, the default of the poll
property was False. I feel that this is a better default, as the
programmer should think about which parameters really need to be
polled.

+ change comment about poll property (meaning depends on Poller)
+ change name of Status datatype to StatusType (avoid name conflicts
  with Status enum type)

Change-Id: Ie405b10ce8dfe85b235dbe78c910b5b5ee22cbb1
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/21407
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/datatypes.py

@@ -40,7 +40,7 @@ __all__ = [
     'BoolType', 'EnumType',
     'BLOBType', 'StringType',
     'TupleOf', 'ArrayOf', 'StructOf',
-    'CommandType',
+    'CommandType', 'StatusType',
 ]
 
 # *DEFAULT* limits for IntRange/ScaledIntegers transport serialisation
@@ -941,7 +941,7 @@ class LimitsType(StructOf):
         return limits
 
 
-class Status(TupleOf):
+class StatusType(TupleOf):
     # shorten initialisation and allow acces to status enumMembers from status values
     def __init__(self, enum):
         TupleOf.__init__(self, EnumType(enum), StringType())