Merge changes from topic 'am-9e981c8e-765c-4b9c-9bad-1a855135f9d3' into ub-launcher3-master

* changes:
  Adding A feature flag to disable widgets  and a corresponding build target Launcher3Go without widgets support am: 64a75aa305
  Adding A feature flag to disable widgets  and a corresponding build target Launcher3Go without widgets support