YADE should implement HTTPS server certificate verification

Current Situation

• The YADE makes use of the non-yet-commons-ssl 3rd-party library that is not prepared to be operated with Java versions newer than 1.8.
• The library prevents successful HTTPS connections as server certificates are not verified against the Java cacerts truststore.

Desired Behavior

• The 3rd-party library is removed.
• YADE makes use of its own JDK-based implementation to verify server certificates.