advotracker: reorganize the project using a crate based structure

* advotracker: the framework project
* crate/advotrackerdb: implementation of the database backend
* crate/advotrackerd: implementation of the backend (daemon)
* crate/adovtracker: implementaton of the application (CLI and GUI)

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

crates/advotracker_client/examples/messages_test/main_view.rs

@@ -0,0 +1,48 @@
+/*
+ * OrbTK - The Orbital Widget Toolkit
+ *
+ * Copyright 2021 Ralf Zerres <ralf.zerres@networkx.de>
+ * SPDX-License-Identifier: (0BSD or MIT)
+ */
+
+use orbtk::prelude::*;
+
+use crate::{
+    receiver::receiver_view::ReceiverView,
+    sender::sender_view::SenderView,
+};
+
+// constants
+pub static ID_SENDER_VIEW: &str = "sender_view";
+pub static ID_RECEIVER_VIEW: &str = "receiver_view";
+
+widget!(MainView {
+    //sender_view: ,
+    //receiver_view:
+});
+
+impl Template for MainView {
+    fn template(self, _id: Entity, ctx: &mut BuildContext<'_>) -> Self {
+        let receiver_view = ReceiverView::new()
+            .build(ctx);
+
+        let sender_view = SenderView::new()
+            .target(receiver_view.0) // entity of the target
+            .build(ctx);
+
+        self.name("MainView")
+            .child(
+                Stack::new()
+                    .orientation("vertical")
+                    .child(sender_view)
+                    .child(receiver_view)
+                    .build(ctx)
+            )
+            // .child(
+            //      TabWidget::new()
+            //          .tab(ID_SENDER_VIEW, SenderView::new().build(ctx))
+            //          .tab(ID_RECEIVER_VIEW, ReceiverView::new().build(ctx))
+            //          .build(ctx),
+            // )
+    }
+}