Gravity Forms Signature Addon 4.6.2

- Fixed signing issue with Windows touch devices.

Added a check to GFSignature::display_signature() to only use mime_content_type() if the signature image file is local.
- Added security enhancements.
- Added the gform_signature_delete_file_pre_delete_entry filter to disable deletion of the signature file or trigger deletion at a later time.

- Added a check to GFSignature::display_signature() to only use mime_content_type() if the signature image file is local.