New aimage settings: width, height, checkpoint, adetailer, auth

[hollowstrawberry]

• width and height are bounded to 256 and 768
• checkpoint has no autocomplete like loras, as I don't know how those are handled exactly
• adetailer depends on the extension of the same name, it greatly improves quality of faces when enabled at the cost of a few seconds
• auth lets you add --api-auth username:password to your webui launch settings for security reasons

[zhaobenny]

ty :)