docs: Fix some mistakes in documentation

feat: Delete symbolic link files

fix: More attributes provided for symbolic links
chore: Convenience open func for SMB2FileHandler

fix: Update libsmb2 submodule branch

fix: fileDescriptor crash, compile error on time

fix: Compilation error due to unsafe flag

fix: Swift build tool compiling error

feat: Set file attributes including creation/modification time.

fix: pathKey value using attributesOfItem

test: Rewrite all tests to use async/await instead of callback

feat: Support Async/Await

Bump. version to 2.7.1

Refactoring async_await(), Bump version