Unzip-http

- change executable to `unzip_http`
- add support for `unzip_http.py` executable for Windows 17

- add RemoteZipInfo.extract() method
- handle large (>64k) central dir
- only warn on missing Accept-Ranges header
- e.g. S3 does not send it but still supports Range Requests

- expand support for the unzip_http library to Python v3.6

API

* parse date_time in ZipInfo
* add RemoveZipFile.extractall()

* add MIT license to file to make it vendorable
* expand support for the unzip_http library to Python v3.7
- (unzip-http bin still requires Python v3.8)

API

* add zip_size attribute (thanks bousqui 6)
* add symbols for eocd magics (thanks bousqui 6)
* make RemoteZipFile a context handler
* RemoteZipFile.files now a cached property

Features

- show sizes in bytes instead of MB
- support ZIP64 (requested by bousqi 4)

Bugfixes

- fix off-by-one: range-requests are inclusive of end byte (reported by bousqi 3)