Remove FMT dependency (#1472)

All occurrences of log() have been replaced with qDebug()

bonus meme: remove a bunch of std::string usages in the pubsub client

Fixes #1467

src/messages/Image.cpp

@@ -14,7 +14,6 @@
 #include "common/NetworkRequest.hpp"
 #include "debug/AssertInGuiThread.hpp"
 #include "debug/Benchmark.hpp"
-#include "debug/Log.hpp"
 #include "singletons/Emotes.hpp"
 #include "singletons/WindowManager.hpp"
 #include "util/DebugCount.hpp"
@@ -108,8 +107,8 @@ namespace detail {
 
         if (reader.imageCount() == 0)
         {
-            log("Error while reading image {}: '{}'", url.string,
-                reader.errorString());
+            qDebug() << "Error while reading image" << url.string << ": '"
+                     << reader.errorString() << "'";
             return frames;
         }
 
@@ -127,8 +126,8 @@ namespace detail {
 
         if (frames.size() == 0)
         {
-            log("Error while reading image {}: '{}'", url.string,
-                reader.errorString());
+            qDebug() << "Error while reading image" << url.string << ": '"
+                     << reader.errorString() << "'";
         }
 
         return frames;