Encryption

Description

Allow all server and client communication to be encrypted

Implements #14 (closed)

What is the current behavior?

No encryption

What is the new/improved behavior?

• Encrypted communication
• Possibility to create/use self-signed certificates
• Adjust codegenerator (CLI parsing)

Does this MR introduce any breaking changes?

No

Checklist:

• The commit messages follow our guidelines
• If necessary, tests have been added
• Docs have been added / updated
• CHANGELOG.md has been updated in the Added/Changed section
• Update wiki
  • encryption in general
  • default CLI parameters of SiLA Servers/Clients ⇒ CLI argument parsing