[core] added functions at updates.py that retry info from pseudo JSON record.
Added function at dates.py that get date from string (located in JSON record).

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extra : amend_source : 97a1f59e7e6b34a7860974bed67f0b5b1176c053
[Updates] added indefication for Win8.1 and Win2k12R2.
At prepareLineToParse added replace in case when date last at JSON record.
Added function 'getUpdatesFromJSONfile' that get info from early saved file.
By the fact - pymongo do not support datetime.date (since there is no BSON type)
but support datetime.datetime so it possible to use that by transform convert
from type to type. So 'pymongoDate2DateTime' from mongoDB do that.
At main.py added third scenarion to load info from JSON to database.
Update tests, change description.