v1.6.0

• fix: Spam score column now sorts values numerically instead of lexicographically.
• feat: Support for X-Ham-Report headers.
• feat: Support for X-Rspam-Status headers.
• feat: Support for X-hMailServer-Spam and X-hMailServer-Reason headers.
• feat: Configurable parsing priority for custom score and details headers. Parsing order can now be set in the add-on settings.