feat!: improve CLI structure, add new commands

This splits most CLI/IPC commands into two categories:

- `var` for ironvars
- `bar` for controlling individual bars.

It also introduces more commands for visibility, as well as breaking existing ones.

New commands:

- `show`
- `hide`
- `toggle_visible`
- `set_popup_visible`
- `get_popup_visible`

Lastly, the implementation of some existing commands has been improved.

BREAKING CHANGE: All IPC commands have changed. Namely, `type` has been changed to `command`, and bar/var related commands are now under a `subcommand`. The full spec can be found on the wiki.

BREAKING CHANGE: Several CLI commands are now located under the `var` and `bar` categories. Usage of any commands to get/set Ironvars or control bar visibility will need to be updated.

BREAKING CHANGE: The `open_popup` and `close_popup` IPC commands are now called `show_popup` and `hide_popup` respectively.

BREAKING CHANGE: The popup `name` argument has been renamed to `widget_name` on all IPC commands.

BREAKING CHANGE: The `set-visibility` CLI command now takes a `true`/`false` positional argument in place of the `-v` flag.

BREAKING CHANGE: `ok_value` responses will no longer print `ok` as the first line when using the CLI

src/bar.rs

@@ -320,6 +320,15 @@ impl Bar {
             Inner::Loaded { popup } => popup.clone(),
         }
     }
+
+    pub fn visible(&self) -> bool {
+        self.window.is_visible()
+    }
+
+    /// Sets the window visibility status
+    pub fn set_visible(&self, visible: bool) {
+        self.window.set_visible(visible)
+    }
 }
 
 /// Creates a `gtk::Box` container to place widgets inside.