dash-frontend: tabs, other fixes (desc)

- set rustfmt line width to 120 columns by default for wgui
- dashboard tabs
- wgui: `remove_children`

dash-frontend/src/tab/apps.rs

@@ -0,0 +1,31 @@
+use wgui::parser::{ParseDocumentParams, ParserState};
+
+use crate::tab::{Tab, TabParams, TabType};
+
+pub struct TabApps {
+	#[allow(dead_code)]
+	pub state: ParserState,
+}
+
+impl Tab for TabApps {
+	fn get_type(&self) -> TabType {
+		TabType::Apps
+	}
+}
+
+impl TabApps {
+	pub fn new(params: TabParams) -> anyhow::Result<Self> {
+		let state = wgui::parser::parse_from_assets(
+			&ParseDocumentParams {
+				globals: params.globals.clone(),
+				path: "gui/tab/apps.xml",
+				extra: Default::default(),
+			},
+			params.layout,
+			params.listeners,
+			params.parent_id,
+		)?;
+
+		Ok(Self { state })
+	}
+}