Fix issue #16 (https://github.com/krzysztofzablocki/IconOverlaying/issues/16). Add app icons for iPad. Adjust text position, and text size for iPhone and iPad.

Use 120x120 app icon to create iPad ones. This means we upscale it for @2x iPad app icons.
Use wildcard * to let the system finds iPad app icons file, this is workaround.