On 2024-04-17, the so-called decentralized autonomous organization has secured legal rights to the doge image,
so using this image with proper licensing is difficult now.
Therefore, I replace the Doge with Yuya Tamai's Shiba dog.
The internet is time-variant, so the source links are unreliable without a date.
Since the webpages can disappear or be moved somewhere else in the future,
authors and titles, if they are not in the URL, should also be mentioned.
This commit also adds the surmised source of the Labradoodle image.
Information about the licenses is incomplete and unclear.
Most dog images are from Wikipedia and have different CC-BY licenses.
The sounds also have different CC-BY licenses and are not share-alike.
Therefore I change the license information as follows:
* Explicitly list sound and texture file names and their associated license
* Specify the actual source of the doge image
* Specify the sources of dogblocks_dog_* texture files where I have figured them out
* Add more detail to sound license information and use the original licenses instead of CC-BY-SA-3.0
The Readme contained duplicate information from the forum topic;
for maintenance it is easier to only link to the forum.
The License did not mention the code license and was ambiguous.
I have licensed the code under MIT,
which the WTFPL license of the original mod allows,
and added SPDX-License-Identifiers to avoid ambiguity where possible.
The exact version of the textures remains unknown.
