CB-3571, CB-2606: support for splashscreens

This is a squash of several commits by @AxelNennker and @vladimir-kotikov.

Includes:
* Add getSplashScreens method to ConfigParser.
* Move common splashscreens/icons logic to getStaticResources method.
* Move findByDensity method to ConfigParser.
* CB-2606: Do not copy default icon to other folders than res/drawable.

github: close #30