refactor: Multiple UI improvements;

Use FrameData struct to store commonly accessed data, in order to
reduce mutex locks.

rename unpause to resume

use get_selected_panel() function instead of directly
gui_state.selected_panel

debug mode now shows some usefull information

src/app_data/mod.rs

@@ -17,6 +17,7 @@ use crate::{
 };
 pub use container_state::*;
 
+#[cfg(not(debug_assertions))]
 /// Global app_state, stored in an Arc<Mutex>
 #[derive(Debug, Clone)]
 pub struct AppData {
@@ -26,6 +27,17 @@ pub struct AppData {
     pub args: CliArgs,
 }
 
+#[cfg(debug_assertions)]
+/// Global app_state, stored in an Arc<Mutex>
+#[derive(Debug, Clone)]
+pub struct AppData {
+    containers: StatefulList<ContainerItem>,
+    error: Option<AppError>,
+    sorted_by: Option<(Header, SortedOrder)>,
+    debug_string: String,
+    pub args: CliArgs,
+}
+
 #[derive(Debug, Clone, Copy, Eq, PartialEq)]
 pub enum SortedOrder {
     Asc,
@@ -64,6 +76,17 @@ impl fmt::Display for Header {
 }
 
 impl AppData {
+    #[cfg(debug_assertions)]
+    pub fn get_debug_string(&self) -> &str {
+        &self.debug_string
+    }
+
+    #[cfg(debug_assertions)]
+    #[allow(unused)]
+    pub fn set_debug_string(&mut self, x: &str) {
+        self.debug_string.push_str(x);
+    }
+
     /// Change the sorted order, also set the selected container state to match new order
     fn set_sorted(&mut self, x: Option<(Header, SortedOrder)>) {
         self.sorted_by = x;
@@ -86,6 +109,7 @@ impl AppData {
     }
 
     /// Generate a default app_state
+    #[cfg(not(debug_assertions))]
     pub fn default(args: CliArgs) -> Self {
         Self {
             args,
@@ -95,6 +119,18 @@ impl AppData {
         }
     }
 
+    /// Generate a default app_state
+    #[cfg(debug_assertions)]
+    pub fn default(args: CliArgs) -> Self {
+        Self {
+            args,
+            containers: StatefulList::new(vec![]),
+            error: None,
+            sorted_by: None,
+            debug_string: String::new(),
+        }
+    }
+
     /// Container sort related methods
 
     /// Remove the sorted header & order, and sort by default - created datetime
@@ -410,18 +446,6 @@ impl AppData {
         self.get_selected_container().map_or(false, |i| i.is_oxker)
     }
 
-    /// Check if the initial parsing has been completed, by making sure that all ids given (which are running) have a non empty cpu_stats vecdec
-    pub fn initialised(&mut self, all_ids: &[(bool, ContainerId)]) -> bool {
-        let count_is_running = all_ids.iter().filter(|i| i.0).count();
-        let number_with_cpu_status = self
-            .containers
-            .items
-            .iter()
-            .filter(|i| !i.cpu_stats.is_empty())
-            .count();
-        count_is_running == number_with_cpu_status
-    }
-
     /// Find the widths for the strings in the containers panel.
     /// So can display nicely and evenly
     pub fn get_width(&self) -> Columns {