[XB] Upload Signature Picture 2.1.0

Better Signature Image Tracking & Upload Controls​

This update introduces signature image history and logging, along with new permissions and upload limits to give administrators more control over how members use images in their signatures.

New Features​

• Added a searchable Signature Image Log in the ACP
• Added historical signature images to the user change log
• Added an option to enable or disable signature image logging (enabled by default)
• Added configurable automatic log cleanup
• Added a permission to bypass signature image logging
• Added a permission to control animated GIF uploads
• Added per-user-group signature image upload limits within a rolling 24-hour period

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XF 2.3 support
Fixed uploading error when XF image optimization enabled
Fix: remove data-redirect="off" from signature form