Adding tag based event filtering

This merge request add a feature to the FilterEvents module that allows to filter events based on tag information.

• The user should include theFilterEvents module and provide the filter_tagssetting as follow :
  - Range based filtering : the tag value is checked to be within a range specified in the configuration file as follows filter_tags = [ "tag_name" , "[minimum_value : maximum_value"] ]. The event is further analyzed if the value is within the range (value being always casted from string to double)
  - List based filtering : the tag value is checked to be matching the values specified in the configuration file as followsfilter_tags = [ "tag_name" , "value_1 , value_2 , ... , value_N" ]. The event is further analyzed if the value matches at least one value of the list.