Add option to close banner

[mario-nt]

Banner could use a button to allow the user to close it.

[mario-nt]

@josecelano With my screen resolution (2560x1600) and scale set to 100% it looks like this (which is the intended behaviour):

But if I change the resolution or zoom in it aligns with the text, I will take another look.

[mario-nt]

@josecelano Hi!, I didn't notice that the layout of the text was changed when I added the x button to close the banner, I will fix that too.

[mario-nt]

Hi @da2ce7, do you like the new layout of the close button or you prefer to have it on the right corner of the banner? I leave a few screenshots so you can see it without getting the branch:

Screenshot #1

Screenshot #2

Screenshot #3

Screenshot #4

[josecelano]

ACK 37d146632faa0248c04cb50f44c866ea416542c7