Should text and image have different entryType

[npm1]

From the TAG review, worth thinking which option is better:

• A single entryType 'element'.
• Two entryType values: 'image' and 'text'.

[tdresser]

We should clearly indicate image vs text somehow.

If we go with image & text, I think:

• first-paint
• first-contentful-paint
• image-paint
• text-paint

is probably the clearest way to name things?

[npm1]

"first-paint" and "first-contentful-paint" are the name values, the entryType values are "paint". So under that reasoning, we should do:

• Keep entryType as "element"
• Set the name to something differentiating image and text. Right now, name is used for images as the URL (and for text, as some characters). But this information could be moved to a different attribute.

[npm1]

This is done.