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Moving PanelViewController and PanelView to android.systemui.shade.
As PanelViewController seems very related to NotificationPanelViewController it might be better for them to live in the same package. Imports have been updated and the scoping has been expanded as necessary. This is a follow up from ag/19202451. Bug: 238333941 Test: atest SystemUITests Change-Id: Ief8ad6dc74056ab3292b94c191eea0e5d209996c