v1.19: Merge pull request #240 from QAston/swapdiskcompat

Updated some assets, fixes a bug with the swap-disk option for PS3
and added a new tool, layout.py (linux only) that helps to see how pic0/pic1 composition will look like on PS3 XMB and also PSP XMB.
This allows easier tweaking of 'pic0-scaling' (to change the scaling of pic0) and
'pic0-offset' (to change the positioning of pic0) than building eboot/pkg and installing on devices.

pic0-scaling/-offset will be used to manually curate the placement of pic0 so that the games look even better than when using the
default positioning, which sometimes cause pic0 to cover imporant details in the pic1 background image.