DalamudPluginInterface functions for opening Settings and DevMenu (#1795)

* Add functions for plugins to open the Developer Menu and Dalamud Settings windows

* Do not break ABI by instead declaring a new method OpenPluginsInstallerTo
Replace OpenDalamudSettings with OpenDalamudSettingsTo

Dalamud/Interface/DalamudWindowOpenKinds.cs

@@ -0,0 +1,53 @@
+namespace Dalamud.Interface;
+
+/// <summary>
+/// Enum describing pages the plugin installer can be opened to.
+/// </summary>
+public enum PluginInstallerOpenKind
+{
+    /// <summary>
+    /// Open to the "All Plugins" page.
+    /// </summary>
+    AllPlugins,
+
+    /// <summary>
+    /// Open to the "Installed Plugins" page.
+    /// </summary>
+    InstalledPlugins,
+
+    /// <summary>
+    /// Open to the "Changelogs" page.
+    /// </summary>
+    Changelogs,
+}
+
+/// <summary>
+/// Enum describing tabs the settings window can be opened to.
+/// </summary>
+public enum SettingsOpenKind
+{
+    /// <summary>
+    /// Open to the "General" page.
+    /// </summary>
+    General,
+    
+    /// <summary>
+    /// Open to the "Look &#038; Feel" page.
+    /// </summary>
+    LookAndFeel,
+
+    /// <summary>
+    /// Open to the "Server Info Bar" page.
+    /// </summary>
+    ServerInfoBar,
+
+    /// <summary>
+    /// Open to the "Experimental" page.
+    /// </summary>
+    Experimental,
+
+    /// <summary>
+    /// Open to the "About" page.
+    /// </summary>
+    About,
+}