[echo-perspective] New document-open icon set

[Luya Tshimbalanga]

Quoting Martin Sourada <martin.sourada at gmail.com>:

> Hi,
>
> I've also finished new document-open icon set [1]. There's not much to
> comment since it's basically just an adaptation of the current Echo icon
> to perspective projection.

Could you match the text from 256x256 to the rest? It is odd the alignment is
not the same.

Luya