This is the normal standard way in C, C++ as well as Java and there's no
longer any reason for ICU to be different. The various internal macros
providing custom boolean constants can all be deleted and code as well
as documentation can be updated to use lowercase true/false everywhere.
Other issues addressed:
* Some performance enhancements were added for good measure. Creating new RuleBasedNumberFormat objects can take a long time due to all the rule parsing. This was ported from ICU4J.
* I fixed a potential infinite recursion problem when RuleBasedNumberFormat used NumberFormat.createInstance, which could occasionally depend on creating RuleBasedNumberFormat for itself, which was bad. This was ported from ICU4J.
* I fixed a potential memory leak due to lazy initialization of some RBNF data members in a multithreaded environment, which is fine in Java, but it's not okay in C++. We no longer cast away const due to this, which is good.
* There were some compiler warnings and errors found while trying to debug this code on my machine. I fixed those too.
X-SVN-Rev: 37810
