refactor: Toast (#4899)

* Fixes a bug where avatars weren't loaded on fresh installations of Chatterino.
* Avatars now update every two weeks.
* Removes misleading `DownlaodManager` (now part of `Toasts.cpp`).
* Refactors usage of WinToast to be easier to read.
* Added version to AUMI.
* Removes manual `QString` → `std::wstring` conversions.
* Removes uses of implicit ASCII casts in `Toasts.cpp`, meaning it can be compiled with `QT_NO_CAST_FROM_ASCII`.

src/singletons/Paths.cpp

@@ -122,9 +122,8 @@ void Paths::initSubDirectories()
 
     // create settings subdirectories and validate that they are created
     // properly
-    auto makePath = [&](const std::string &name) -> QString {
-        auto path = combinePath(this->rootAppDataDirectory,
-                                QString::fromStdString(name));
+    auto makePath = [&](const QString &name) -> QString {
+        auto path = combinePath(this->rootAppDataDirectory, name);
 
         if (!QDir().mkpath(path))
         {
@@ -140,11 +139,11 @@ void Paths::initSubDirectories()
     this->cacheDirectory_ = makePath("Cache");
     this->messageLogDirectory = makePath("Logs");
     this->miscDirectory = makePath("Misc");
-    this->twitchProfileAvatars = makePath("ProfileAvatars");
+    this->twitchProfileAvatars =
+        makePath(combinePath("ProfileAvatars", "twitch"));
     this->pluginsDirectory = makePath("Plugins");
     this->themesDirectory = makePath("Themes");
     this->crashdumpDirectory = makePath("Crashes");
-    //QDir().mkdir(this->twitchProfileAvatars + "/twitch");
 }
 
 Paths *getPaths()