Add some Right-To-Left language workarounds.

MixerBoard, LyricsWindow, Screenshot and most effects are now LTR in RTL locales.
Also added a pref so this can be overridden.  As RTL affects window creation, the language choice and this preference may only fully take effect after a restart of Audacity.

src/LyricsWindow.cpp

@@ -114,6 +114,8 @@ LyricsWindow::LyricsWindow(AudacityProject *parent):
    //pToolBar->Realize();
 
    mLyricsPanel = safenew LyricsPanel(this, -1, panelPos, panelSize);
+   RTL_WORKAROUND(mLyricsPanel);
+
 
    //vvv Highlight style is broken in ported version.
    //switch (mLyricsPanel->GetLyricsStyle())