launch.py: Simplify run()

    return stored_git_tag

def run(command, desc=None, errdesc=None, custom_env=None, live: bool = default_command_live):

def run(command, desc=None, errdesc=None, custom_env=None, live: bool = default_command_live) -> str:

    if desc is not None:

        print(desc)

    if live:

        result = subprocess.run(command, shell=True, env=os.environ if custom_env is None else custom_env)

        if result.returncode != 0:

            raise RuntimeError(f"""{errdesc or 'Error running command'}.

Command: {command}

Error code: {result.returncode}""")

    run_kwargs = {

        "args": command,

        "shell": True,

        "env": os.environ if custom_env is None else custom_env,

        "encoding": 'utf8',

        "errors": 'ignore',

    }

        return ""

    if not live:

        run_kwargs["stdout"] = run_kwargs["stderr"] = subprocess.PIPE

    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, env=os.environ if custom_env is None else custom_env)

    result = subprocess.run(**run_kwargs)

    if result.returncode != 0:

        message = f"""{errdesc or 'Error running command'}.

Command: {command}

Error code: {result.returncode}

stdout: {result.stdout.decode(encoding="utf8", errors="ignore") if len(result.stdout)>0 else '<empty>'}

stderr: {result.stderr.decode(encoding="utf8", errors="ignore") if len(result.stderr)>0 else '<empty>'}

"""

        raise RuntimeError(message)

    return result.stdout.decode(encoding="utf8", errors="ignore")

        error_bits = [

            f"{errdesc or 'Error running command'}.",

            f"Command: {command}",

            f"Error code: {result.returncode}",

        ]

        if result.stdout:

            error_bits.append(f"stdout: {result.stdout}")

        if result.stderr:

            error_bits.append(f"stderr: {result.stderr}")

        raise RuntimeError("\n".join(error_bits))

    return (result.stdout or "")

def check_run(command):