Ability to start creating a pattern from the context menu

[x9136]

Since messages are often the source of patterns, it would be handy to have an option to create a pattern from the context menu.

RMB on a message → Create a pattern... → The pattern table opens with the entered message and the highlighted line → Refine the pattern if necessary → Ok

[pajlada]

This could be handy for quick-creating highlights / ignores / filters, so when created it should take that into consideration when making the menu entry.