Simple streamlink support (#97)

* Simple streamlink support

Relies on settings entry & loads best available quality by default.

src/widgets/settingsdialog.cpp

@@ -312,6 +312,8 @@ void SettingsDialog::addTabs()
         auto scroll = new QSlider(Qt::Horizontal);
         form->addRow("Mouse scroll speed:", scroll);
 
+        form->addRow("Streamlink Path", createLineEdit(settings.streamlinkPath));
+
         //        v->addWidget(scroll);
         //        v->addStretch(1);
         //        vbox->addLayout(v);
@@ -583,6 +585,18 @@ QHBoxLayout *SettingsDialog::createCombobox(
     return box;
 }
 
+QLineEdit *SettingsDialog::createLineEdit(pajlada::Settings::Setting<std::string> &setting)
+{
+    auto widget = new QLineEdit(QString::fromStdString(setting.getValue()));
+
+    QObject::connect(widget, &QLineEdit::textChanged, this,
+                     [&setting](const QString &newValue) {
+                        setting = newValue.toStdString();
+                     });
+
+    return widget;
+}
+
 void SettingsDialog::okButtonClicked()
 {
     this->close();