More fixes for ANKSearchQuery

Introduce the ability to conditionally serialize BOOL values to JSON output. Many ANKSearchQuery properties are actually filter flags and by explicitly sending *either* 0 or 1, we would be filtering search results. By overriding localKeysConditionallyExcludedFromJSONOutput in an ANKResource, you can now specify properties whose values should be checked against ANKBOOLPropertyInclusionType.