Background and layout fixes

Changed background graphics and changed a lot of stuff for black and
transparent settting. Had to remove temperature coloring of background
images else it looked aweful on black theme. This also fixes strange
looking transition effects between pages. bottom bar have same size now.
Only problem I see is when there is no station set with black theme. But
that was already like that before my changes.
Merged
Merge branch 'Morpog-sailfishos' into sailfishos