Refactoring of the Query Object: add support for complete filter logic

simplify field selection on the query object
separate API from query building functions
add support for field selection [done]
add support for field sorting [done]
add support for field grouping (GROUP BY)
add support for aggregation functions (count, max, min, sum, etc.. including grouping detection and validation)
add support for IN [done]
add support for NOT IN
add support for LIKE [done]
add support for NOT LIKE
add support for LESS THAN, GREATHER THAN, LESS OR EQUAL, GREATER OR EQUAL [done]
add support for condition grouping
add support for NOT
add support for OR

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