Merge "Rename splitscreen package to legacysplitscreen"

libs/WindowManager/Shell/res/layout/docked_stack_divider.xml

libs/WindowManager/Shell/res/raw/wm_shell_protolog.json

...r/Shell/src/com/android/wm/shell/ShellCommandHandler.java

...ndowManager/Shell/src/com/android/wm/shell/ShellInit.java

...m/android/wm/shell/draganddrop/DragAndDropController.java

...c/com/android/wm/shell/draganddrop/DragAndDropPolicy.java

...hell/src/com/android/wm/shell/draganddrop/DragLayout.java

...android/wm/shell/legacysplitscreen/DividerHandleView.java

...roid/wm/shell/legacysplitscreen/DividerImeController.java

.../com/android/wm/shell/legacysplitscreen/DividerState.java

...c/com/android/wm/shell/legacysplitscreen/DividerView.java

...roid/wm/shell/legacysplitscreen/DividerWindowManager.java

.../shell/legacysplitscreen/ForcedResizableInfoActivity.java

...acysplitscreen/ForcedResizableInfoActivityController.java

.../wm/shell/legacysplitscreen/LegacySplitDisplayLayout.java

...android/wm/shell/legacysplitscreen/LegacySplitScreen.java

.../shell/legacysplitscreen/LegacySplitScreenController.java

...hell/legacysplitscreen/LegacySplitScreenTaskListener.java

...droid/wm/shell/legacysplitscreen/MinimizedDockShadow.java

...ndroid/wm/shell/legacysplitscreen/WindowManagerProxy.java