Refactor configuration file parsing

Now the time for importing the kitty.config module has been halved, from
16ms from 32ms on my machine. Also, the new architecture will eventually
allow for auto generating a bunch of python-to-C boilerplate code.

kitty/utils.py

@@ -14,19 +14,23 @@ from contextlib import suppress
 from functools import lru_cache
 from time import monotonic
 from typing import (
-    Any, Callable, Dict, Generator, Iterable, List, Mapping, Match, NamedTuple,
-    Optional, Tuple, Union, cast
+    TYPE_CHECKING, Any, Callable, Dict, Generator, Iterable, List, Mapping,
+    Match, NamedTuple, Optional, Tuple, Union, cast
 )
 
 from .constants import (
     appname, is_macos, is_wayland, read_kitty_resource, shell_path,
     supports_primary_selection
 )
-from .options_stub import Options
 from .rgb import Color, to_color
 from .types import run_once
 from .typing import AddressFamily, PopenType, Socket, StartupCtx
 
+if TYPE_CHECKING:
+    from .options.types import Options
+else:
+    Options = object
+
 
 def expandvars(val: str, env: Mapping[str, str] = {}, fallback_to_os_env: bool = True) -> str: