Next chapter of 'Bitmap strips for Rockboxed': the greyscale versions and the ports...

Next chapter of 'Bitmap strips for Rockboxed': the greyscale versions and the ports which use 'small colour' icons (c200 and small H10). To get rid of some more bitmaps I put statically loaded bitmaps into the already existing backdrop, but one of these files can't be deleted yet because it's used in other colour version (will be done once this is ready). Also remove the unnecessary coordinates in the backdrop tag and add the missing codecs in the codec conditional. The volume and battery icons are now made of one graphic (part of a strip) for each step of the conditional, the combining of small images made a really confusing wps code and isn't helpfull anymore (I think it was done to reduce the amount of files in the svn directory...). Also rename the sl-* bmps to shuffle-* and the hd-* to lock-* bmps. - Don't forget to clean up your 'Rockboxed' directory.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17067 a1c6a512-1295-4272-9138-f99709370657