[ios] - add the launchimage for iphone5 screens to the info.plist - restores iphone5 resolution on ios8
[ios] - replace the launch images holding the XBMC logo with plain black images (as those aren't shown on most devices anyways and our startup time is fast enough to not need visible launch images)
Merge pull request #5630 from Memphiz/ip5fix

[ios] - fix iphone5s screensize on ios8.x runtime