Fix #270: on iOS, List doesn't scroll correctly when it is inside a deli...

Set position:absolute, width:100% and height:100% on List's inner node => The List is no longer sized by its children
Set width:100% and height:100% as default on List => The List's parent height must be defined, see List.md
AFAIK, it's not possible to stack vertically two elements (in this case the text and the List) to fill 100% of the page without flexbox, si I used LinearLayout.
Setting an height in pixel on the List would let us drop LinearLayout but the 100% use-case looks more usual.