This commit adds the BottomSheetBehavior to the
formatting toolbar appearing from bottom.
CoordinatorLayout replaces the RelativeLayout in activity_main
and bottom toolbar is made the child of it.
Also, Add 'adjustPan' option to LibreOfficeMainActivity's
windowSoftInputMode flag so as to prevent soft keyboard
from pushing the views up

Change-Id: Ic9999c1177ac238bc7c482a69daec4e629fe6d93
Reviewed-on: https://gerrit.libreoffice.org/35768Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>