skin rework (FS#10922) notable changes:
- simplify the setting/skin relationship. settings are used as the fallback if it's not specified in the skin
- backdrop buffers are now in the skin buffer (which has also increased slightly to accomodate 1 backdrop for each skin and 2 full colour screens for bmps (up for 1.5))
- if no %X is specified in a skin then the backdrop setting will be used. use %Xd to explicitly disable a skin from displaying a backdrop
- the base skin can now specify a backdrop.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24366 a1c6a512-1295-4272-9138-f99709370657
19 files changed: