0.2.3 "Gotta Keep Em Iterated"

This release mostly contains fixes for the iteration through int- and long-keyed maps, as well as fixing two-argument nextInt() and nextSignedInt() for EnhancedRandom, adding BooleanDeque, and some miscellaneous other improvements. The iteration fixes are the most important of these to have in a stable release, though it's also nice to have rand.nextInt(low, high) not return some large, out-of-range value.

I also was able to finally fix the issue that precipitated jdkgdxds existing: libGDX 1.9.10's cuckoo-hashed maps would produce OutOfMemoryErrors in some situations (that could be exploited easily by unskilled malicious actors). Now there's a ObjectObjectCuckooMap in the tests that includes a fix for that... but benchmarks showed that even with cuckoo's supposedly better algorithm that guarantees constant-time containsKey(), if the cuckoo-map can't fail, it can't have constant-time operations as a tradeoff. They also showed that it's significantly slower at insertions (0.5x throughput) and not significantly faster at anything (nothing over 1.1x throughput). So, we can be fully satisfied with the algorithm used currently in jdkgdxds (and libGDX).