AMIGAOS: Make use of the new drawer icon

On AmigaOS the user can customize every icon including drawers.

This is a customized drawer icon for ScummVM with the original "S"
scaled on top of it.

This icon may change with further revisions of AmigaOS4 (if the
default icon images change).
CGE2: Remove fallback detection for English translation.
MADS: Remove unused variables.
CGE: Remove fallback detection.
Merge pull request #501 from raziel-/patch-3

AMIGAOS: Add and make use of a new drawer icon
MADS: Beginnings of resource loading in AnimView
MADS: Further resource entry initialization