Add an option to save images

[aledeg]

The option will allow to save the image encoded in base64 in the database.
A caution warning message must be added to warn about database growth.

it would be nice as it will act as a proxy and help to prevent all removed images.

[aledeg]

That was my initial thought but I am not sure now. I mean, there is already a proxy extension.
I didn't check how it work though. I need to think about it thoroughly before trying anything.

currently I am using the proxy extension but it still not does the job very well, furthermore it do not grab a copy of the picture, and often the picture has been deleted since.