Add more defaults to the stdlib (#9606)

Continuing work towards #8988.

The first five commits were created using stubdefaulter on various Python versions; the following commits were all created manually by me to fix various problems. The main things this adds that weren't present in #9501 are:

- Defaults in Windows-only modules and Windows-only branches (because I'm running a Windows machine)
- Defaults in non-py311 branches
- Defaults for float parameters
- Defaults for overloads

stdlib/tkinter/filedialog.pyi

@@ -41,21 +41,21 @@ class FileDialog:
     filter_button: Button
     cancel_button: Button
     def __init__(
-        self, master, title: Incomplete | None = ...
+        self, master, title: Incomplete | None = None
     ) -> None: ...  # title is usually a str or None, but e.g. int doesn't raise en exception either
     how: Incomplete | None
-    def go(self, dir_or_file=..., pattern: str = ..., default: str = ..., key: Incomplete | None = ...): ...
-    def quit(self, how: Incomplete | None = ...) -> None: ...
+    def go(self, dir_or_file=".", pattern: str = "*", default: str = "", key: Incomplete | None = None): ...
+    def quit(self, how: Incomplete | None = None) -> None: ...
     def dirs_double_event(self, event) -> None: ...
     def dirs_select_event(self, event) -> None: ...
     def files_double_event(self, event) -> None: ...
     def files_select_event(self, event) -> None: ...
     def ok_event(self, event) -> None: ...
     def ok_command(self) -> None: ...
-    def filter_command(self, event: Incomplete | None = ...) -> None: ...
+    def filter_command(self, event: Incomplete | None = None) -> None: ...
     def get_filter(self): ...
     def get_selection(self): ...
-    def cancel_command(self, event: Incomplete | None = ...) -> None: ...
+    def cancel_command(self, event: Incomplete | None = None) -> None: ...
     def set_filter(self, dir, pat) -> None: ...
     def set_selection(self, file) -> None: ...
 
@@ -116,7 +116,7 @@ def askdirectory(
 
 # TODO: If someone actually uses these, overload to have the actual return type of open(..., mode)
 def asksaveasfile(
-    mode: str = ...,
+    mode: str = "w",
     *,
     confirmoverwrite: bool | None = ...,
     defaultextension: str | None = ...,
@@ -128,7 +128,7 @@ def asksaveasfile(
     typevariable: StringVar | str | None = ...,
 ) -> IO[Incomplete] | None: ...
 def askopenfile(
-    mode: str = ...,
+    mode: str = "r",
     *,
     defaultextension: str | None = ...,
     filetypes: Iterable[tuple[str, str | list[str] | tuple[str, ...]]] | None = ...,
@@ -139,7 +139,7 @@ def askopenfile(
     typevariable: StringVar | str | None = ...,
 ) -> IO[Incomplete] | None: ...
 def askopenfiles(
-    mode: str = ...,
+    mode: str = "r",
     *,
     defaultextension: str | None = ...,
     filetypes: Iterable[tuple[str, str | list[str] | tuple[str, ...]]] | None = ...,