Amulet-nbt

Bugfix and API improvement release for Amulet-NBT

Changes
- Added the `get()` method to `NBTFile` object, arguments and behavior is the same as the `get()` method from `dict` objects
- Added a check to ensure that only GZip'd files are decompressed by checking the gzip header

Bugfix release for Amulet-NBT

Changes
- Fixed an issue when creating an TAG_List from a SNBT string that contained an empty list

Bugfix release for Amulet-NBT

Changes
- Added a `.pop()` method to the `NBTFile` class that behaves like the `dict.pop()` method
- Fixed an issue where unnecessary warnings were printed when saving `_TAG_Array` subclasses
- Fixed an issue in `from_snbt()` where strings wouldn't be un-escaped if they had quotes around them
- Changed the `name` argument in the `setup()` call in `setup.py` to match the expected normalized form described in [PEP 503](https://www.python.org/dev/peps/pep-0503/#normalized-names)

Initial release of the Amulet-NBT library

This library is a continuation and port of the old PyMCLevel NBT library to Python 3.7. However, this library also has additional features and departures.

Changes
- Loaded NBT files are now contained in a `NBTFile` object which allows for the setting of the root name for NBT/DAT files
- `NBTFile` objects act as a wrapper around `TAG_Compound` objects, so accessing top-level keys from the NBTFile object will work the same as it would from the TAG_Compound object
- Little endian support is no longer a context specific mode or state, little and big endian files can be saved and loaded via boolean flags to the respective methods
- NBT arrays, such as TAG_Int_Array and TAG_Long_Array, do not immediately cast the supplied array to the required dtype for that tag array, but will cast to appropriate dtype when saving in both little and big endian mode
- All NBT Tag objects have a `to_snbt()` method which return the object's value as a valid SNBT string as outlined on the [Minecraft NBT Wiki page](https://minecraft.gamepedia.com/NBT_format)
- A `from_snbt()` method was added to parse full NBT tag objects from a given SNBT string
- A pure python implementation is also present and will be used instead if the cython version cannot be loaded
- If you wish to know which version was loaded, the `amulet_nbt.IMPLEMENTATION` attribute will return "cython" for the cython version and "python" for the pure-python one.