Changed Streamer Mode settings (#2001)

There's now a new (yet another, sigh) section in Settings -> General, which lets you set streamer mode to 'enable/disable/detect obs' and there are also separate settings for each of the things that streamer mode covers. I just have to add ping sounds and PR is ready to be merged :)

* Show "Streamer Mode" image as link thumbnails if applicable

* Moved hideViewerCountAndDuration to streamerMode settings

Set it to false by default (just how it used to be under /misc settings, also reworked live tooltip to be a bit prettier and say "<Streamer Mode>" in gray instead of "Live with <hidden> for <hidden> viewers"

src/widgets/helper/ChannelView.cpp

@@ -1314,13 +1314,21 @@ void ChannelView::mouseMoveEvent(QMouseEvent *event)
         {
             auto element = &hoverLayoutElement->getCreator();
             auto thumbnailSize = getSettings()->thumbnailSize;
-            if (thumbnailSize == 0 || isInStreamerMode())
+            if (!thumbnailSize)
             {
                 tooltipPreviewImage.setImage(nullptr);
             }
             else
             {
-                tooltipPreviewImage.setImage(element->getThumbnail());
+                const auto isHideLink =
+                    isInStreamerMode() &&
+                    getSettings()->streamerModeHideLinkThumbnails &&
+                    (!element->getThumbnail()->url().string.isEmpty());
+                auto thumb =
+                    isHideLink ? Image::fromPixmap(getResources().streamerMode)
+                               : element->getThumbnail();
+                tooltipPreviewImage.setImage(std::move(thumb));
+
                 if (element->getThumbnailType() ==
                     MessageElement::ThumbnailType::Link_Thumbnail)
                 {