Create a mode to generate keys

[GWBasic]

There should be a mode to generate public and private keys.

For example, "bounce keys" should generate both public and private keys, ideally encoded using base64. Example output:

Bounce
Generating keys
Public key: gesTREYngfdeEREWT675437
Private key: jytr7654HGSHT245hfdgh

[GWBasic]

Complete