Added /marry command with propose, accept, reject, divorce, tp and give options.

• /marry propose [USERNAME] Sends proposal to user which can be accepted or denied.
• /marry accept [USERNAME] To accept a proposal from a specific user.
• /marry reject [USERNAME] To reject a proposal from a specific user.
• /marry divorce To end current marriage. Doesn’t require confirmation.
• /marry tp Teleports you to your partner instantly if you are both on the same dimension.
• /marry give Sends the item you are currently holding to your partner if you are both on the same dimension.