change: Adjust gix::dirwalk::Options::{X,set_X} parameter names

This adjusts the names of parameters to `X` and `set_X` methods of
`gix::dirwalk::Options` (where `X` is an option name) to use a
systematic naming convention:

- For the same option `X`, the `X` and `set_X` methods now always
  have the same name of the parameter that specifies a value for an
  option.

- Options whose type is `bool` are named `toggle`, in keeping with
  the prevailing convention in this code.

- Options of `Option` type are named `value` (this required no
  changes).

- Options of a non-`Option` type `*Mode` -- currently this is just
  `EmissionMode` -- are named `mode`.

gix/src/dirwalk/options.rs

@@ -115,13 +115,13 @@ impl Options {
         self
     }
     /// Controls the way untracked files are emitted. By default, this is happening immediately and without any simplification.
-    pub fn emit_untracked(mut self, toggle: EmissionMode) -> Self {
-        self.emit_untracked = toggle;
+    pub fn emit_untracked(mut self, mode: EmissionMode) -> Self {
+        self.emit_untracked = mode;
         self
     }
     /// Like [`emit_untracked()`](Self::emit_untracked), but only requires a mutably borrowed instance.
-    pub fn set_emit_untracked(&mut self, toggle: EmissionMode) -> &mut Self {
-        self.emit_untracked = toggle;
+    pub fn set_emit_untracked(&mut self, mode: EmissionMode) -> &mut Self {
+        self.emit_untracked = mode;
         self
     }
     /// If `toggle` is `true`, emit empty directories as well. Note that a directory also counts as empty if it has any
@@ -180,8 +180,8 @@ impl Options {
 
     /// Like [`symlinks_to_directories_are_ignored_like_directories()`](Self::symlinks_to_directories_are_ignored_like_directories),
     /// but only requires a mutably borrowed instance.
-    pub fn set_symlinks_to_directories_are_ignored_like_directories(&mut self, value: bool) -> &mut Self {
-        self.symlinks_to_directories_are_ignored_like_directories = value;
+    pub fn set_symlinks_to_directories_are_ignored_like_directories(&mut self, toggle: bool) -> &mut Self {
+        self.symlinks_to_directories_are_ignored_like_directories = toggle;
         self
     }
 }