Sort and limit ChooserActivity targets from ChooserTargetServices

Apply an automated decay factor if apps decide to claim all of their
targets are SUPER IMPORTANT. Apply the multiplier from the apps
themselves as well as a penalty for apps that come in late - let's see
how fast developers get their ChooserTargetServices to start!

Also fix a bug with ResolverDrawerLayout where dragging from the title
area wouldn't always work properly.

Bug 22302285

Change-Id: Ib6eb2b6fb92608790b2267c0f671c9ae59b2907e