supporting viewpanecontainer in panels with PaneCompositePanel and ViewContainerLocation

Part of microsoft/vscode-remote-release#1777

- Import aliasing symbol in file
- Missing function calls in conditional
- Missing return statement

Fix microsoft/vscode-remote-release#1426

* First pass at set view title

* Change to get/set instead of setTitle

and get the name of the view from the extension contributions

Part of #76941

The first argument is now the element that the command is executed on. The second argurment is an array of the other selected items

Part of #78168

by fixing the tree width, which was not being set

Fixes #78177

Emitters should be disposed of properly in order to help prevent leaks