Investigate better editor pane and editor focus handling

[suhay]

Enhancement requests:

• Ability to select the editor tab/s and add selected tabs to a named group
• Add the focused editor group tabs to a new minimized group (Currently, every editor group's tab is added)
• Add the focused editor group tabs to an existing group
• Restore the minimized editor tab group into a new editor group (to right, left, down or up)

Referenced issues:

https://github.com/suhay/vscode-editor-group-minimizer/issues/10 https://github.com/suhay/vscode-editor-group-minimizer/issues/9