Allow shorthand for lazyloading images

[raikasdev]

Closes #58

[height]

This pull request has been linked to 1 task:

• T-10073 Air-helperin kuvakoot ei toimi loogisesti (unlink task)

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[ronilaukkarinen]

@raikasdev Does this work if someone has used the previous syntax? Isn't this a breaking change now?

[raikasdev]

@ronilaukkarinen No, it checks if it's a string, so this shouldn't break the old syntax (array).

[EliasKau]

Merged to branch 3.0.8rc