Support for the UnrealScript language

Here's my attempt to add UnrealScript support.

I'm not sure if it's working properly just yet, though, since for me building ohcount fails with the error ```run_tests: test/unit/detector_test.h:119: test_detector_detect_polyglot: Assertion `lang' failed.``` (I'm not sure what's the reason for that, maybe I'm missing some dependencies or such; this is pointing to the line "ASSERT_DETECT(LANG_PHP, "upper_case_php");", not to my code additions).

I also hope I didn't edit too many files. I'm not sure if any of these files are supposed to be auto-generated or not (I just wrote them all manually).