Custom Payloads version 0.13.0

Changed

• Update minimum ZAP version to 2.14.0.
• Maintenance changes.
• Promoted to Beta.

Added

• Initial API support:
  • Actions
    • Enable payloads.
    • Disable payloads.
    • Enable payload.
    • Disable payload.
    • Add payload.
    • Remove payload.
  • Views:
    • Payload categories.
    • Payloads (optionally filtered by category).