josh ugens: CombLP - void float->double->float conversion

Signed-off-by: Tim Blechmann <tim@klingt.org>
tag system ugens: don't overwrite sc's public API

overriding sc's public API is a great way to avoid any improvements like
support for local buffers or buffer locking

Signed-off-by: Tim Blechmann <tim@klingt.org>
cmake build system: support for native/c++11/dso visibility

Signed-off-by: Tim Blechmann <tim@klingt.org>
nova ugens: GendyN - handle memory allocation failure

Signed-off-by: Tim Blechmann <tim@klingt.org>
cmake build system: don't add NovaUGens to plugin dirs extra

Signed-off-by: Tim Blechmann <tim@klingt.org>
SkUGens: add SkUGens (FM7 only)

 - original repo is at https://github.com/kaoskorobase/skUG
SkUGens: adapt FM7 to new plugin interface
SkUGens: FM7 - port help file to SCDoc format
removed debug comments
minor