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/logging/vst2.h

@@ -87,5 +87,5 @@ class Vst2Logger {
      * Determine whether an event should be filtered based on the current
      * verbosity level.
      */
-    bool should_filter_event(bool is_dispatch, int opcode) const;
+    bool should_filter_event(bool is_dispatch, int opcode) const noexcept;
 };