Implement stupid account manager

After logging in, you need to restart chatterino

src/application.cpp

@@ -1,4 +1,5 @@
 #include "application.hpp"
+#include "accountmanager.hpp"
 #include "colorscheme.hpp"
 #include "logging/loggingmanager.hpp"
 #include "settingsmanager.hpp"
@@ -25,6 +26,10 @@ Application::Application()
     // Initialize everything we need
     this->emoteManager.loadGlobalEmotes();
 
+    AccountManager::getInstance().load();
+
+    this->ircManager.setUser(AccountManager::getInstance().getTwitchUser());
+
     // XXX
     SettingsManager::getInstance().updateWordTypeMask();