scripts: runner: add build-time .conf parser

        return {int(b) for b in used_bytes}

class BuildConfiguration:

    '''This helper class provides access to build-time configuration.

    Configuration options can be read as if the object were a dict,

    either object['CONFIG_FOO'] or object.get('CONFIG_FOO').

    Configuration values in .config and generated_dts_board.conf are

    available.'''

    def __init__(self, build_dir):

        self.build_dir = build_dir

        self.options = {}

        self._init()

    def __getitem__(self, item):

        return self.options[item]

    def get(self, option, *args):

        return self.options.get(option, *args)

    def _init(self):

        build_z = os.path.join(self.build_dir, 'zephyr')

        generated = os.path.join(build_z, 'include', 'generated')

        files = [os.path.join(build_z, '.config'),

                 os.path.join(generated, 'generated_dts_board.conf')]

        for f in files:

            self._parse(f)

    def _parse(self, filename):

        with open(filename, 'r') as f:

            for line in f:

                line = line.strip()

                if not line or line.startswith('#'):

                    continue

                option, value = line.split('=', 1)

                self.options[option] = self._parse_value(value)

    def _parse_value(self, value):

        if value.startswith('"') or value.startswith("'"):

            return value.split()

        try:

            return int(value, 0)

        except ValueError:

            return value

class RunnerCaps:

    '''This class represents a runner class's capabilities.