Added code-runner.stopWait command

[Chrysaloid]

I find it annoying having to close windows produced by Python's matplotlib.pyplot before running the code again.

So I created this keyboard shortcut:

    {
        "key": "f5",
        "command": "runCommands",
        "args": {
            "commands": [
                "code-runner.stop",
                "code-runner.run",
            ]
        },
    },

But the run commands was being executed too soon - before previous process fully closed - so the new process could not be registered correctly. The result was that new processes (matplotlib windows) would spawn every time I pressed F5.

So I created stopWait command that waits for the process to emit "close" event after it receives the kill signal.

It is a drop-in replacement for the stop command in the shortcut:

    {
        "key": "f5",
        "command": "runCommands",
        "args": {
            "commands": [
                "code-runner.stopWait",
                "code-runner.run",
            ]
        },
    },

I'm using Python as an example here but this should work for any programming language that waits for anything when run (i.e. user input, network request).