remove TeeOutputStream, just use the one from commons-io, it's only 90kb
next to isBlank isNotBlank we now have blank/notBlank that will throw an IllegAlargumentException in case the expected state is violated
ass Longs for some basic checks such as positive/negative/zero etc
fix a typo and re-use Strings class
v1.1.4 set where individual methods can be enabled/disabled - need this for an add-only scenarion, to prevent removal etc by implementors