Added posibility to make thumbnail auto rebuilt after thread first post changes (Refer to the case of @Capturimage here: https://xenforo.com/community/threads/d-c-style-thumbnail.185177/post-1680993)
Fixed crash when upgrading to the new version (Refer to the cases of @Capturimage & @fiebrelectora here: https://xenforo.com/community/threads/d-c-style-thumbnail.185177/post-1680378 and https://xenforo.com/community/threads/d-c-style-thumbnail.185177/post-1680380)
Fixed bug opening thumbnail URL instead of thread URL (Refer to the case of @Capturimage here: https://xenforo.com/community/threads/d-c-style-thumbnail.185177/post-1680378)
