BannerImage rework

This MR tries to improve BannerImage.qml which includes:

• add extra options to customize banner image (title color, shadow rectangle color and opacity)
• expand shadowed rectangle horizontally if it does not cover enough space (when only some space is not covered)
• animations when shadowed rectangle is expanded
• visible property at the end

I tested it with these qml files:

• globalDrawerTest.qml
• cardTest.qml

Problems I