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/messages/SharedMessageBuilder.cpp

@@ -7,6 +7,7 @@
 #include "providers/twitch/TwitchCommon.hpp"
 #include "singletons/Settings.hpp"
 #include "singletons/WindowManager.hpp"
+#include "util/StreamerMode.hpp"
 
 namespace chatterino {
 
@@ -365,6 +366,12 @@ void SharedMessageBuilder::triggerHighlights()
 {
     static QUrl currentPlayerUrl;
 
+    if (isInStreamerMode() && getSettings()->streamerModeMuteMentions)
+    {
+        // We are in streamer mode with muting mention sounds enabled. Do nothing.
+        return;
+    }
+
     if (getCSettings().isMutedChannel(this->channel->getName()))
     {
         // Do nothing. Pings are muted in this channel.