Gravity Forms 2.9.1.2

- Fixed issue which caused multisites to experience a fatal error on plugin activation.

- Fixed issue with Dynamic Field Map on some add-ons including HubSpot Add-On and User Registration Add-On.
- Fixed issue with form import not properly sanitizing JSON string in some cases.
- Fixed an issue where uploaded files are not deleted on entry deletion if a custom upload path is used.

- Fixed performance issue with Generic Map settings field.
- Fixed issue with Generic Map and Dynamic Field Map not being able to filter the value drop down to include or exclude field types.
- Fixed issue with Generic Map settings field not being able to specify a custom list of choices for mapping.
- Fixed an issue where files uploaded via the multi-file upload field are corrupted when chunking is enabled using [gform_plupload_settings](https://docs.gravityforms.com/gform_plupload_settings/).