Work on porting kittens to use new key infrastructure

Also move type definitions into their own module

kitty/types.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+# License: GPLv3 Copyright: 2021, Kovid Goyal <kovid at kovidgoyal.net>
+
+from typing import NamedTuple
+
+
+class ParsedShortcut(NamedTuple):
+    mods: int
+    key_name: str
+
+
+class Edges(NamedTuple):
+    left: int = 0
+    top: int = 0
+    right: int = 0
+    bottom: int = 0
+
+
+class FloatEdges(NamedTuple):
+    left: float = 0
+    top: float = 0
+    right: float = 0
+    bottom: float = 0
+
+
+class ScreenGeometry(NamedTuple):
+    xstart: float
+    ystart: float
+    xnum: int
+    ynum: int
+    dx: float
+    dy: float
+
+
+class WindowGeometry(NamedTuple):
+    left: int
+    top: int
+    right: int
+    bottom: int
+    xnum: int
+    ynum: int
+    spaces: Edges = Edges()
+
+
+class SingleKey(NamedTuple):
+    mods: int = 0
+    is_native: bool = False
+    key: int = -1