Refactor global shortcuts, simplify debug consoles

- Move out all shortcuts from their central file to the component they
  actually belong to

- Get rid of DebugConsoleLoader and the multiple consoles handling mess,
  have only one global console

src/gui/Pages/Chat/Timeline/EventContent.qml

@@ -65,17 +65,9 @@ HRowLayout {
     // ~600px max with a 16px font
     readonly property int maxMessageWidth: theme.fontSize.normal * 0.5 * 75
 
-    readonly property alias debugConsoleLoader: debugConsoleLoader
-
     readonly property alias selectedText: contentLabel.selectedText
 
 
-    DebugConsoleLoader {
-        id: debugConsoleLoader
-        active: false
-        onLoaded: item.runJS("json()")
-    }
-
     Item {
         id: avatarWrapper
         opacity: collapseAvatar ? 0 : 1