add static fields, now can be added some predefined columns to event stream

[slmzig]

Issue #, if available:
#216
Description of changes:

now via agent.conf you can add static fields to you event

for example:

      "dataProcessingOptions": [
        {
          "optionName": "CSVTOJSON",
          "staticFields":
            {
              "host": "server1"
            }
          ,
          "customFieldNames": [
            "type",
            "timeLogged",
...

now each event will contain a new field host

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[IzekChen]

Really nice one. Wonder when will be merged and released