enhancement - Versioning system for images

[MetaBarj0]

This issue is about to manage version of images.
Today, images does not provide the concept of version. The only version concept you can find is about the source files you download thanks to a variable in the manifest file.
The purpose of this issue is to implement a way to manage version of images.

• The version of an image can match the version of sources downloaded to build it
• At the end, version the image could help to update them easily
• Version could serve in dependency resolution as well as the image name
• …specification in prgress