Align git command palette interaction with command line

[chrmarti]

• VSCode Version: 1.7

Intuitively I'd expect git branch -d some_name to allow me to delete a branch. Other subcommands could be supported the same way, for some the completion item might tell you what it does (like when creating a branch), for others it's fine if it doesn't.

I like how it supports creating a new branch by assuming an unknown name after git checkout is a branch to be created. That could be kept almost the same, except the completion item would tell you that it will insert the -b option for you.

[joaomoreno]

We will very likely go away from this whole feature, as git turns to an extension.

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