SNI for connection test
- Added SNI (Server Name Indication) support to the connection test functionality - means if you are downloading a TLS certificate from a partner that is on a virtual host and requires SNI you will get the right/expected certificate
- Added the possibility to delete all unused, expired key/certificate entries of the certificate manager with a single click. Therefor a new menu item has been added: "File-Delete all expired keys/certificates". Deleting these old entries is recommended because it makes no sense to perform cryptographic operations with expired certificates.