Issue #2831937 by mtodor, seanB, Wim Leers, phenaproxima, l0ke, webflo, tedbow, Gábor Hojtsy, slashrsm, naveenvalecha, mondrake, oriol_e9g, dawehner, vijaycs85: Add "Image" MediaSource plugin

Issue #2831936 by marcoscano, seanB, chr.fritsch, l0ke, Wim Leers, vijaycs85, phenaproxima, pguillard, johndevman, drubb: Add "File" MediaSource plugin