Deprecate setFailUnrecognizedDescriptorLines()
We have two methods, DescriptorParser#setFailUnrecognizedDescriptorLines()
and DescriptorReader#setFailUnrecognizedDescriptorLines()
that a) are never used in known code and that b) can be easily replaced by checking whether Descriptor#getUnrecognizedLines()
contains any lines.
We should get rid of those methods.