Send photo(s) in photo property, not as part of content property

[paulrobertlloyd]

When posting a note with a photo, Icro sends the following request to a Micropub endpoint:

h = "entry"
name = ""
content = "Martello tower.\n" +  "![96053175-02F9-4950-86D7-F960971FE008.jpg(https://getindiekit.github.io/sandbox/media/photos/2020/09/05/6q5e4.jpg)"

However, if a post contains a photo, the photo(s) should be sent using the photo property. So in the above case, the following would be sent instead:

h = "entry"
name = ""
content = "Martello tower"
photo[] = "https://getindiekit.github.io/sandbox/media/photos/2020/09/05/6q5e4.jpg"
mp-photo-alt[] = "96053175-02F9-4950-86D7-F960971FE008.jpg"

This structured format has many benefits. First, it means a server can identify the type of post (note or photo) and potentially process it differently; perhaps using a different permalink format.

It also means authors can work with the content and photo(s) data individually. For example, with the current data provided, it’s not possible to output the following HTML:

<p>Martello tower</p>

<figure>
  <img src="https://getindiekit.github.io/sandbox/media/photos/2020/09/05/6q5e4.jpg" alt="">
  <figcaption><p>96053175-02F9-4950-86D7-F960971FE008.jpg</p></figcaption>
</figure>