Make filter using functions

-- make setters that take multiple useful things and set the filter
value to type string, simplifies everything
-- make "boolean passesFilter(Requirement req)" Takes a Requirement and
performs the filtering specified inside the current Filter by checking
the operator, filter type and appropriate values of the Requirement
-- make "perform" in OperatorType.java for use in passesFilter- purpose
is to take the arguments that need to be compared in some way, then
performs the appropriate operations.
-- Fix spelling in FilterType.java
Merge branch 'dev-iteration2' of https://github.com/gsisko/wpi-suite-tng into dev-iteration2