Rework UnexpectedErrorPopup to be more practical

- Instead of opening a popup for every single error that occurs,
  combine them into an unique one

- Increase the maximum width, make those tracebacks readable

src/gui/UI.qml

@@ -9,6 +9,7 @@ import QtGraphicalEffects 1.12
 import "."
 import "Base"
 import "MainPane"
+import "Popups"
 
 Item {
     id: mainUI
@@ -38,6 +39,7 @@ Item {
     readonly property alias debugConsole: debugConsole
     readonly property alias mainPane: mainPane
     readonly property alias pageLoader: pageLoader
+    readonly property alias unexpectedErrorPopup: unexpectedErrorPopup
     readonly property alias fontMetrics: fontMetrics
     readonly property alias idleManager: idleManager
 
@@ -177,4 +179,8 @@ Item {
 
         GlobalTapHandlers { pageLoader: parent }
     }
+
+    UnexpectedErrorPopup {
+        id: unexpectedErrorPopup
+    }
 }