Add noexcept qualifications in src/common

Apparently this can actually make a difference in some cases, and the
C++ Core Guideliens recommend doing this on all default constructors,
destructors, and all functions that can not throw (and thus also don't
allocate).

src/common/communication/vst2.cpp

@@ -16,6 +16,8 @@
 
 #include "vst2.h"
 
+DefaultDataConverter::~DefaultDataConverter() noexcept {}
+
 EventPayload DefaultDataConverter::read(const int /*opcode*/,
                                         const int /*index*/,
                                         const intptr_t /*value*/,