[TIMOB-15328] Blackberry: Implement support for landscape splash screen

Description

There is no support for landscape splash screen when launching an app in landscape orientation. Upon loading in landscape mode the splash screen showed the portrait but stretched. Created four splash screens for both Q10 and Z10 form factors to support both landscape and portrait orientations. Verified that files are copied into build folder

Steps to reproduce

1) Create a default blackberry application and disable the window opening to better see the splash screen. 2) Drop in attached images (Splash.zip) 3) Add the following code into tiapp.xml

<blackberry>
    <orientation>auto</orientation>
</blackberry>

4) Run app on device held in landscape orientation.

Result

Scaled portrait splash screen is displayed in landscape view.

Expected result

Landscape splash screen to be shown.