Revert "Revert "HALO notification should open in floating window mode""

This reverts commit 5a7d3300707eeb8ce16686cc7d091381eb394e24.
Revert "mutliwindow: notify split view if layout changed"

This reverts commit ee23a1cdb3fdaf213bf26a8cfc39c42b5126b701.
Revert "HALO notification should open in floating window mode"

This reverts commit fc4864d4a6615c1533126b1c2157891f15167211.
Revert "prevent multiwindow if halo enabled"

This reverts commit d8c326c8614d7fb20b640e6f0f5dc44059cba673.
Frameworks: MasterSwitch to Enable/Disable HALO