Cursors: Add new Magnifying glass cursor

There are a few places in the system where this could be useful,
such as PixelPaint and the MandelBrot demo. It seems general enough
that it is probably useful to have it as a system-wide cursor rather
than loading it manually each time.

Base/res/cursor-themes/Dark/Config.ini

@@ -16,3 +16,4 @@ Drag=drag.png
 Wait=wait.f14t100.png
 Crosshair=crosshair.png
 Eyedropper=eyedropper.x2y2.png
+Zoom=zoom.x0y0.png

Base/res/cursor-themes/Default/Config.ini

@@ -16,3 +16,4 @@ Drag=drag.png
 Wait=wait.f14t100.png
 Crosshair=crosshair.png
 Eyedropper=eyedropper.x2y2.png
+Zoom=zoom.x0y0.png

Userland/Libraries/LibGfx/StandardCursor.h

@@ -27,6 +27,7 @@ enum class StandardCursor {
     Wait,
     Disallowed,
     Eyedropper,
+    Zoom,
     __Count,
 };
 

Userland/Services/WindowServer/Cursor.cpp

@@ -111,6 +111,8 @@ RefPtr<Cursor> Cursor::create(Gfx::StandardCursor standard_cursor)
         return WindowManager::the().disallowed_cursor();
     case Gfx::StandardCursor::Eyedropper:
         return WindowManager::the().eyedropper_cursor();
+    case Gfx::StandardCursor::Zoom:
+        return WindowManager::the().zoom_cursor();
     default:
         VERIFY_NOT_REACHED();
     }

Userland/Services/WindowServer/WindowManager.cpp

@@ -2081,6 +2081,7 @@ void WindowManager::apply_cursor_theme(const String& theme_name)
     reload_cursor(m_wait_cursor, "Wait");
     reload_cursor(m_crosshair_cursor, "Crosshair");
     reload_cursor(m_eyedropper_cursor, "Eyedropper");
+    reload_cursor(m_zoom_cursor, "Zoom");
 
     Compositor::the().invalidate_cursor();
     m_config->write_entry("Mouse", "CursorTheme", theme_name);

Userland/Services/WindowServer/WindowManager.h

@@ -151,6 +151,7 @@ public:
     Cursor const& drag_cursor() const { return *m_drag_cursor; }
     Cursor const& wait_cursor() const { return *m_wait_cursor; }
     Cursor const& eyedropper_cursor() const { return *m_eyedropper_cursor; }
+    Cursor const& zoom_cursor() const { return *m_zoom_cursor; }
 
     Gfx::Font const& font() const;
     Gfx::Font const& window_title_font() const;
@@ -366,6 +367,7 @@ private:
     RefPtr<Cursor> m_wait_cursor;
     RefPtr<Cursor> m_crosshair_cursor;
     RefPtr<Cursor> m_eyedropper_cursor;
+    RefPtr<Cursor> m_zoom_cursor;
 
     RefPtr<MultiScaleBitmaps> m_overlay_rect_shadow;