New certificate manager features
<ul>
<li>Certificate manager: Display the sign algorithm and the name of the EC curve in the overview</li>
<li>Key generation: Adding support for SHA-2 512, SHA2 512 PSSRSA, SHA3 512 und SHA-3 512 PSSRSA signed keys</li>
<li>Added the description howto setup a TLS proxy for inbound TLS connections to the documentation</li>
<li>Added the possibility to generate a subject key identifier (ski) extension in the key generator of the certificate manager</li>
<li>Added an own notification for client-server connection problems - formerly it was just reported as system error which is not really the case</li>
<li>Dependency: Updated jetty to 10.0.16</li>
<li>Dependency: Updated MINA (client-server framework) to v2.2.3</li>
</ul>