Nyquist plug-in installer added

Ran "autoreconf --force --no-recursive" for Linux build.

Add nyquist-plug-in-installer.ny to Windows build

Add Nyquist Plug-in Installer to mac build

Fix translation strings in plug-in installer

src/effects/nyquist/LoadNyquist.cpp

@@ -33,6 +33,7 @@ const static wxChar *kShippedEffects[] =
    wxT("limiter.ny"),
    wxT("lowpass.ny"),
    wxT("notch.ny"),
+   wxT("nyquist-plug-in-installer.ny"),
    wxT("pluck.ny"),
    wxT("rhythmtrack.ny"),
    wxT("rissetdrum.ny"),