New new design for ResolverActivity

Switch back to using a list as the grid and differently positioned
activity icons were confusing to users. Keep the distinct "last used"
presentation but align icons and titles with the further choices
below. Adjust this to make the fold more apparent. Remember
open/closed slider state across config changes.

Fix some bugs in nested scrolling and flinging.

Bug 17301272

Change-Id: I175937d5821df27b6ac7ffad7f01cd9a6ed3e3e3