added cmd_line commands to remapper

[xconverge]

This fixes #1166

example usage:

       {
           "before":["<C-n>"],
           "after":[],
            "commands": [
                {
                    "command": ":nohl",
                    "args": []
                }
            ]
       },
       {
           "before":["<C-r>"],
           "after":[],
            "commands": [
                {
                    "command": ":%s/test/123/g",
                    "args": []
                }
            ]
       }

[xconverge]

I will move this flag to vimState.globalState instead of Configuration so that this can be removed

[johnfn]

Awesome. LGTM