PURE-189: Group all containers (vector, canvas, widget, ...) into a
single interface for the MapPresenter
PURE-190: Move Tile and TileCode to the "render" package.
PURE-191: Clean up MapConfiguration and remove the MapOptions
definition.
PURE-192: Remove the OpacitySupported interface. It's methods should be
part of the basic Layer definition.
PURE-193: Remove HasLegendWidget
PURE-196: Add a getInstance/setInstance to the GeomajasServerExtension.