Implement the "inline" account switch button

Make the account switch listview into a widget

src/widgets/accountswitchpopupwidget.cpp

@@ -0,0 +1,51 @@
+#include "widgets/accountswitchpopupwidget.hpp"
+#include "debug/log.hpp"
+#include "widgets/settingsdialog.hpp"
+
+#include <QHBoxLayout>
+#include <QLayout>
+#include <QPushButton>
+#include <QVBoxLayout>
+
+namespace chatterino {
+namespace widgets {
+
+AccountSwitchPopupWidget::AccountSwitchPopupWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    this->setWindowFlags(Qt::FramelessWindowHint);
+
+    this->setContentsMargins(0, 0, 0, 0);
+
+    this->ui.accountSwitchWidget = new AccountSwitchWidget(this);
+    QVBoxLayout *vbox = new QVBoxLayout(this);
+    this->ui.accountSwitchWidget->setFocusPolicy(Qt::NoFocus);
+    vbox->addWidget(this->ui.accountSwitchWidget);
+
+    // vbox->setSizeConstraint(QLayout::SetMinimumSize);
+
+    auto hbox = new QHBoxLayout();
+    auto manageAccountsButton = new QPushButton(this);
+    manageAccountsButton->setText("Manage Accounts");
+    hbox->addWidget(manageAccountsButton);
+    vbox->addLayout(hbox);
+
+    connect(manageAccountsButton, &QPushButton::clicked, []() {
+        SettingsDialog::showDialog(SettingsDialog::PreferredTab::Accounts);  //
+    });
+
+    this->setLayout(vbox);
+}
+
+void AccountSwitchPopupWidget::refresh()
+{
+    this->ui.accountSwitchWidget->refresh();
+}
+
+void AccountSwitchPopupWidget::focusOutEvent(QFocusEvent *)
+{
+    this->hide();
+}
+
+}  // namespace widgets
+}  // namespace chatterino