STRIIIIIIIIIIIINGS
- Ported most of the string stdlib, with the exceptions of the format() method and StringBuffer.
- Fixed a buncha bugs in the Unicode utils because stupid signed chars. Sigh.
- Made many more internals use crocstrs instead of const char*s because Croc strings can have embedded 0s.
- Greatly reduced use of C string functions for the same reason.
- Implemented some string utils.
- Moved what used to be croc/utils into croc/util/str and croc/util/misc; moved croc/utf into croc/util/utf
- Buncha new string helpers in croc/util/str; changed delimiters to an inside-out iterator because C++ iterators blow
- Fixed DArray operator== to allow comparing arrays of differing lengths (like in D)
- Added DArray operator!=,<,<=,>,>= and cmp()