dede942007
This PR introduces a few important changes to secure media redaction in emails. First of all, two new site settings have been introduced: * `secure_media_allow_embed_images_in_emails`: If enabled we will embed secure images in emails instead of redacting them. * `secure_media_max_email_embed_image_size_kb`: The cap to the size of the secure image we will embed, defaulting to 1mb, so the email does not become too big. Max is 10mb. Works in tandem with `email_total_attachment_size_limit_kb`. `Email::Sender` will now attach images to the email based on these settings. The sender will also call `inline_secure_images` in `Email::Styles` after secure media is redacted and attachments are added to replace redaction messages with attached images. I went with attachment and `cid` URLs because base64 image support is _still_ flaky in email clients. All redaction of secure media is now handled in `Email::Styles` and calls out to `PrettyText.strip_secure_media` to do the actual stripping and replacing with placeholders. `app/mailers/group_smtp_mailer.rb` and `app/mailers/user_notifications.rb` no longer do any stripping because they are earlier in the pipeline than `Email::Styles`. Finally the redaction notice has been restyled and includes a link to the media that the user can click, which will show it to them if they have the necessary permissions. 
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