Move gen scripts into their own package

gen/__main__.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+# License: GPLv3 Copyright: 2023, Kovid Goyal <kovid at kovidgoyal.net>
+
+
+import os
+import sys
+
+
+def main(args: list[str]=sys.argv) -> None:
+    os.chdir(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+    sys.path.insert(0, os.getcwd())
+    if len(args) == 1:
+        raise SystemExit('usage: python gen which')
+    which = args[1]
+    del args[1]
+    if which == 'apc-parsers':
+        from gen.apc_parsers import main
+        main(args)
+    elif which == 'config':
+        from gen.config import main
+        main(args)
+    elif which == 'srgb-lut':
+        from gen.srgb_lut import main
+        main(args)
+    elif which == 'key-constants':
+        from gen.key_constants import main
+        main(args)
+    elif which == 'go-code':
+        from gen.go_code import main
+        main(args)
+    elif which == 'wcwidth':
+        from gen.wcwidth import main
+        main(args)
+    else:
+        raise SystemExit(f'Unknown which: {which}')
+
+
+if __name__ == '__main__':
+    main()