supernova: libc++ compile fixes

workarounds for strict allocator requirements

Signed-off-by: Tim Blechmann <tim@klingt.org>
scide: server - add shortcuts to show scope, freqscope & node tree

Signed-off-by: Tim Blechmann <tim@klingt.org>
cmake build system: clang++/c++11 means we have to use libc++

Signed-off-by: Tim Blechmann <tim@klingt.org>