6/N Move everything into SysUIComponent.

It is far easier to move _everything_ into SysUIComponent, and then
selectively promote things back to GlobalScope and/or WMScope than
it is to try to do it one at a time. With this change, though lots
of files are touched, very little actually changes structurally.

After this change goes in, folks should stop using @Singleton quite
so freely. Most things should live in @SysuiSingleton. @Singleton
is due to quickly be replaced by @GlobalScope.

Bug: 162923491
Test: atest SystemUITests && manual
Change-Id: Idc31d3d83b030581fb1fa869f7fafc4f2d3a8828