Added setting options to control the menu context display.

[tiansin]

@qcz In this way, we can freely control which command menus are displayed, rather than fixed.

[qcz]

Not a bad idea. However I'm waiting for the completion of microsoft/vscode#100172, so I can put all possible commands into nice submenus. Let's see how that turns out and if it won't be suitable for what I imagined, I'll implement your idea.

[qcz]

The submenu API is available now in VS Code Insiders, so I've experimented with it. All commands are available in the submenus and I think it looks great:

[tjx666]

Waiting for it, now there is too many menu items in my editor context

[qcz]

1.16.0 with the new submenu feature is already published to the VS Code Extension Marketplace. It will be immediately available when VSCode 1.50 releases next week, and it is already available if you use VS Code Insiders.