Min and max are swapped when the range is empty

[finkn]

If a parameter is defined using expressions in such a way that the range is empty, the result is that min and max are swapped. This also interacts in surprising ways with exclusive limits. They end up extending the range rather than restricting it.

See https://github.com/finkn/InPUTspec/blob/master/main/src/net/finkn/inputspec/v050/AdvancedSingleRangeNextTest.java. Particularly limitsAreSwappedForEmptyInclusiveRange and emptyExclusiveRangeIsExtendedWhenSwapped.