Efs2 Versions Save

This release of Efs2 is more to solidify on the new versioning following Go mod best practices. This release also adds some new features.

• Passphrase support for SSH Keys
• Password-based authentication support
• RUN is now just RUN; however, RUN CMD and RUN SCRIPT are still supported but undocumented
• A Quiet flag is now included to suppress output

In addition to the above, some internal code clean up made the Efs2 codebase a bit cleaner.

Initial Release:

• Supports the PUT and RUN [CMD|SCRIPT] instructions.
• Parallel Execution through the -p or --parallel flags.
• Custom SSH User and Port via command line flags.
• Define specific SSH Keyfile.