This refactors the last bit of code that depends on the OpenSSL C
library. Note that the openssl-probe does not depend on OpenSSL, it only
tries to detect the CA certificate directory on the host system.
This still depends on unreleased diesel and diesel-async code. As soon
as new diesel and diesel-async code has been released, we can remove
the [patch.crates-io] from Cargo.toml.
This refactor the UI components from class based element into function
based elements. This makes it possible to use hooks that are used now
by most React components. This also updates React and Ant to the latest
versions (+ other dependencies).
