lv2-plugin

<c/p von Quelle: dkbuilder: from circuit to LV2 plugin >> https://linuxmusicians.com/viewtopic.php?f=44&t=19586> #### Pre-requests: geda, geda-gattrib, geda-gnetlist, geda-gschem, geda-gsymcheck, geda-symbols, python-virtualenv, virtualenv, virtualenvwrapper, faust 0.9.90, libeigen3-dev...