Fixed some lingering problems with roboRIO support for joysticks.
Added some null checks to BooleanFilter.
Extended BooleanMixing with press/release events and subscribable OR and
AND operations.
Extended FloatMixing with subscribable comparisons, renaming, and a few
other things.

(The renaming is allowed because we haven't had a release since they were
added.)
Extended FloatOperation to work on more kinds of channels.
Preemptively fixed a concurrency issue in MultipleSourceBooleanController.
Moved a useful utility function for InstinctModules to the superclass.
Added a direct access function for getting the Utils version of the
current time.
Fixed the Java versions associated with the robot projects.