Complete refactoring of interface code. Addition of 'Enable Mods' checkmark, that just (de)activates all mods at once without changing settings. Allow editing of mod json inside the interface in advanced mode.

Penumbra/UI/TabInstalled.cs

@@ -0,0 +1,53 @@
+using ImGuiNET;
+
+namespace Penumbra.UI
+{
+    public partial class SettingsInterface
+    {
+        private partial class TabInstalled
+        {
+            private const string LabelTab = "Installed Mods";
+
+            private readonly SettingsInterface _base;
+            public  readonly Selector          _selector;
+            public  readonly ModPanel          _modPanel;
+
+            public TabInstalled(SettingsInterface ui)
+            {
+                _base     = ui;
+                _selector = new(_base);
+                _modPanel = new(_base, _selector);
+            }
+
+            private void DrawNoModsAvailable()
+            {
+                ImGui.Text( "You don't have any mods :(" );
+                ImGuiCustom.VerticalDistance(20f);
+                ImGui.Text( "You'll need to install them first by creating a folder close to the root of your drive (preferably an SSD)." );
+                ImGui.Text( "For example: D:/ffxiv/mods/" );
+                ImGui.Text( "And pasting that path into the settings tab and clicking the 'Rediscover Mods' button." );
+                ImGui.Text( "You can return to this tab once you've done that." );
+            }
+
+            public void Draw()
+            {
+                var ret = ImGui.BeginTabItem( LabelTab );
+                if( !ret )
+                    return;
+
+                if (_base._plugin.ModManager.Mods != null)
+                {
+                    _selector.Draw();
+                    ImGui.SameLine();
+                    _modPanel.Draw();
+                }
+                else
+                    DrawNoModsAvailable();
+
+                ImGui.EndTabItem();
+
+                return;
+            }
+        }
+    }
+}