Need SharingImage to be able to trigger email app

[maddalihanumateja]

We could have a restricted set of actions (send email, take a photo, display some text, ... or some 3rd party app actions). A good goal would be to have an email action image that would trigger prompts asking about the receiver and the message and finally send the email using the gmail API (assuming that the user has a gmail account).

• [x] Just try launching an app given an input photo
• [x] Providing additional input to the 3rd party app (before it launches and within our own app )

[maddalihanumateja]

Implemented a toy example in the 6-sharing-image-trigger-action branch to open the email client using this stack overflow post and an array to store which images have already been shown to the camera.

Need to refer to the following links to create a set of allowed actions (take photo, record audio, say something, open email ...)

• [Apple developer docs on custom app urls] (https://developer.apple.com/documentation/uikit/core_app/communicating_with_other_apps_using_custom_urls)
• Opening gmail using an app url in swift

[maddalihanumateja]

Also, when associating the AR reference images with the SharingImage list objects of the table controller I'm using the title to store information (SharingImage name and type). There might be a better way to do this.