Allow registering keybindings commands using strings

[71]

Feature request

Currently, custom commands can be added using the following syntax:

{
    "vim.normalModeKeyBindings": [
        {
            "before":["<C-n>"],
            "commands": [
                {
                    "command": ":nohl"
                }
            ]
        }
    ]
}

This request proposes to add the following syntax, when arguments are unnecessary:

{
    "vim.normalModeKeyBindings": [
        {
            "before":["<C-n>"],
            "commands": [ ":nohl" ]
        }
    ]
}

In the previous code block, ":nohl" is interpreted as { "command": ":nohl" }.