feat: fully implement orientation/justify options

Adds `orientation` and `justify` options to all modules and custom
widgets where it makes sense to do so.

Any modules without support document this. Widgets fully document the
options inline where present for now.

Resolves #296

src/config/layout.rs

@@ -0,0 +1,37 @@
+use crate::config::{ModuleJustification, ModuleOrientation};
+use crate::modules::ModuleInfo;
+use serde::Deserialize;
+
+#[derive(Clone, Debug, Deserialize, Default)]
+#[cfg_attr(feature = "schema", derive(schemars::JsonSchema))]
+pub struct LayoutConfig {
+    /// The orientation to display the widget contents.
+    /// Setting to vertical will rotate text 90 degrees.
+    ///
+    /// **Valid options**: `horizontal`, `vertical`
+    /// <br>
+    /// **Default**: `horizontal`
+    orientation: Option<ModuleOrientation>,
+
+    /// The justification (alignment) of the widget text shown on the bar.
+    ///
+    /// **Valid options**: `left`, `right`, `center`, `fill`
+    /// <br>
+    /// **Default**: `left`
+    #[serde(default)]
+    pub justify: ModuleJustification,
+}
+
+impl LayoutConfig {
+    pub fn orientation(&self, info: &ModuleInfo) -> gtk::Orientation {
+        self.orientation
+            .map(ModuleOrientation::into)
+            .unwrap_or(info.bar_position.orientation())
+    }
+
+    pub fn angle(&self, info: &ModuleInfo) -> f64 {
+        self.orientation
+            .map(ModuleOrientation::to_angle)
+            .unwrap_or(info.bar_position.angle())
+    }
+}