Add GlobalActionsColumnLayout to replace HardwareUILayout.

Refactor code to improve code re-use and enable testing, and add lots of unit tests.
HardwareUILayout is no longer used.

Test: Automated tests pass. Manual testing with different display sizes and with panel plugin enabled/disabled.

Fixes: 130808177
Fixes: 128372852

Change-Id: I1e48d226973a9b610cece2691af7b233cdb5235c