[client] spice: new option spice:showCursorDot added

This option if disabled will prevent the client from showing a "dot"
cursor when the mouse is over the window, but the window is unfocused.

client/src/app.c

@@ -63,6 +63,9 @@ void app_handleFocusEvent(bool focused)
       for (int key = 0; key < KEY_MAX; key++)
         if (g_state.keyDown[key])
           app_handleKeyRelease(key);
+
+    if (!g_params.showCursorDot)
+      g_state.ds->showPointer(false);
   }
 
   g_cursor.realign = true;

client/src/config.c

@@ -421,6 +421,13 @@ static struct Option options[] =
     .type           = OPTION_TYPE_BOOL,
     .value.x_bool   = false
   },
+  {
+    .module        = "app",
+    .name          = "showCursorDot",
+    .description   = "Use a \"dot\" cursor when the window does not have focus",
+    .type          = OPTION_TYPE_BOOL,
+    .value.x_bool  = true
+  },
   {0}
 };
 
@@ -554,6 +561,7 @@ bool config_load(int argc, char * argv[])
     g_params.scaleMouseInput  = option_get_bool("spice", "scaleCursor");
     g_params.captureOnStart   = option_get_bool("spice", "captureOnStart");
     g_params.alwaysShowCursor = option_get_bool("spice", "alwaysShowCursor");
+    g_params.showCursorDot    = option_get_bool("spice", "showCursorDot");
   }
 
   return true;

client/src/main.h

@@ -151,6 +151,7 @@ struct AppParams
   bool              rawMouse;
   bool              autoCapture;
   bool              captureInputOnly;
+  bool              showCursorDot;
 };
 
 struct CBRequest