Huge refactor

- Remove some underscore-prefixes
 - Start using this-> more
 - Remove a few of the singletons (We pass references to managers to
         things that need it now. Might not be much better, but for now
         it works. It also shows what places might be slightly wrong
         designed)

src/widgets/chatwidget.cpp

@@ -30,9 +30,10 @@ inline void ezShortcut(ChatWidget *w, const char *key, T t)
 
 }  // namespace
 
-ChatWidget::ChatWidget(QWidget *parent)
+ChatWidget::ChatWidget(ChannelManager &_channelManager, QWidget *parent)
     : QWidget(parent)
-    , channel(ChannelManager::getInstance().getEmpty())
+    , channelManager(_channelManager)
+    , channel(_channelManager.getEmpty())
     , vbox(this)
     , header(this)
     , view(this)
@@ -90,7 +91,7 @@ void ChatWidget::setChannelName(const QString &_newChannelName)
 
     // remove current channel
     if (!this->channelName.isEmpty()) {
-        ChannelManager::getInstance().removeChannel(this->channelName);
+        this->channelManager.removeChannel(this->channelName);
 
         this->detachChannel();
     }
@@ -104,7 +105,7 @@ void ChatWidget::setChannelName(const QString &_newChannelName)
     if (newChannelName.isEmpty()) {
         this->channel = nullptr;
     } else {
-        this->setChannel(ChannelManager::getInstance().addChannel(newChannelName));
+        this->setChannel(this->channelManager.addChannel(newChannelName));
     }
 
     // update header
@@ -240,7 +241,7 @@ void ChatWidget::doChangeChannel()
 void ChatWidget::doPopup()
 {
     // TODO: Copy signals and stuff too
-    auto widget = new ChatWidget();
+    auto widget = new ChatWidget(this->channelManager);
     widget->setChannelName(this->getChannelName());
     widget->show();
 }