Xmlsec

- Fix installation via pip

- Fixed build for windows platform

- add method to load symmetric key from memory Key.from_binary_data
- add support decryption of EncodedKey
- fix segfautl in Key.from_binary_file
- fix debug trace

- Fixed memory leaks
- Added parameter 'id' to method `xmlsec.template.create`, 'name' is deprecated.
- Added more useful constants

- Added binding for method xmlSecTmplTransformAddC14NInclNamespaces
- Added new constants: NsExcC14N, NsExcC14NWithComments

Added documentation