Corrected documentation implying that NbtFile.RootTag may be null.
Fixed a case where NbtReader would not set its state to NbtParseState.Error after encountering certain kinds of parse errors.
Fixed ToString() methods of various NbtTags not respecting NbtTag.DefaultIndentString
Expanded NbtList unit tests to cover IList/ICollection/IList<NbtTag> implementations.
Expanded NbtFile unit tests to cover loading/saving little-endian-encoded files, as well as reading root tags from GZip- and ZLib-compressed streams, including non-seekable streams.
Expanded NbtReader unit tests to cover skipping on non-seekable streams and error-handling on corrupt streams.