UI: Add options to enable/disable stream confirm dialogs

Some streamers would accidentally hit start/stop streaming, which on
certain services would send out mass emails to all their followers.
This just adds options to general settings to optionally enable dialogs
that confirm whether to actually start/stop streaming when the button is
clicked.

obs/window-basic-settings.cpp

@@ -263,6 +263,8 @@ OBSBasicSettings::OBSBasicSettings(QWidget *parent)
 
 	HookWidget(ui->language,             COMBO_CHANGED,  GENERAL_CHANGED);
 	HookWidget(ui->theme, 		     COMBO_CHANGED,  GENERAL_CHANGED);
+	HookWidget(ui->warnBeforeStreamStart,CHECK_CHANGED,  GENERAL_CHANGED);
+	HookWidget(ui->warnBeforeStreamStop, CHECK_CHANGED,  GENERAL_CHANGED);
 	HookWidget(ui->outputMode,           COMBO_CHANGED,  OUTPUTS_CHANGED);
 	HookWidget(ui->streamType,           COMBO_CHANGED,  STREAM1_CHANGED);
 	HookWidget(ui->simpleOutputPath,     EDIT_CHANGED,   OUTPUTS_CHANGED);
@@ -741,6 +743,14 @@ void OBSBasicSettings::LoadGeneralSettings()
 	LoadLanguageList();
 	LoadThemeList();
 
+	bool warnBeforeStreamStart = config_get_bool(GetGlobalConfig(),
+			"BasicWindow", "WarnBeforeStartingStream");
+	ui->warnBeforeStreamStart->setChecked(warnBeforeStreamStart);
+
+	bool warnBeforeStreamStop = config_get_bool(GetGlobalConfig(),
+			"BasicWindow", "WarnBeforeStoppingStream");
+	ui->warnBeforeStreamStop->setChecked(warnBeforeStreamStop);
+
 	loading = false;
 }
 
@@ -1954,6 +1964,13 @@ void OBSBasicSettings::SaveGeneralSettings()
 				  theme.c_str());
 		App()->SetTheme(theme);
 	}
+
+	config_set_bool(GetGlobalConfig(), "BasicWindow",
+			"WarnBeforeStartingStream",
+			ui->warnBeforeStreamStart->isChecked());
+	config_set_bool(GetGlobalConfig(), "BasicWindow",
+			"WarnBeforeStoppingStream",
+			ui->warnBeforeStreamStop->isChecked());
 }
 
 void OBSBasicSettings::SaveStream1Settings()