timob-13686: first implementation of listview headerView and footerView
timob-13686: implemented 'canScroll' and 'separatorColor' properties
timob-13686: add default values for 'canScroll'
timob-13686: modify documentation
timob-13686-v1: implement header/footerView for sections
timob-13686: remove support for 'canScroll'
timob-13686: add doc for section header/footerView
timob-13686: fix a layout issue + code clean up
timob-13686: fix threading issue.
timob-13686-v1: addressed comment
Merge pull request #4747 from hieupham007/timob-13686-v1

Timob 13686 v1: Listview headerView, footerView, canScroll, separatorColor