Add option to disable clearing screen

Somewhat hacky and might cause other issues, but should fix #365

ui/ui.go

@@ -67,6 +67,7 @@ func NewGomuksUI(gmx ifc.Gomuks) ifc.GomuksUI {
 func (ui *GomuksUI) Init() {
 	mauview.Backspace2RemovesWord = ui.gmx.Config().Backspace2RemovesWord
 	mauview.Backspace1RemovesWord = ui.gmx.Config().Backspace1RemovesWord
+	ui.app.SetAlwaysClear(ui.gmx.Config().AlwaysClearScreen)
 	clipboard.Initialize()
 	ui.views = map[View]mauview.Component{
 		ViewLogin: ui.NewLoginView(),