Increase MIDI event count limits for VST2

This really shouldn't be needed, but apparently there are plugins that
output more than 2048 events per buffer.

https://github.com/robbert-vdh/yabridge/issues/35#issuecomment-1138176117

CHANGELOG.md

@@ -75,6 +75,9 @@ Versioning](https://semver.org/spec/v2.0.0.html).
   **REAPER** not working.
 - Fixed an obscure issue with VST3 plugins crashing in **Ardour** on
   Arch/Manjaro because of misreported parameter queue lengths.
+- Fixed yabridge throwing assertion failures on serialization when using some of
+  the _Orchestral Tools_ Kontakt libraries in the VST2 version of Kontakt. Some
+  of those libraries would output more than 2048 MIDI events in a single buffer.
 - Some of yabridge's socket file names contained extremely aesthetically
   unpleasing trailing underscores. Begone pesky underscores!
 - Fixed building with VST3 support disabled.

src/common/serialization/vst2.h

@@ -45,9 +45,11 @@ constexpr size_t max_audio_channels = 16384;
  */
 constexpr size_t max_buffer_size = 16384;
 /**
- * The maximum number of MIDI events in a single `VstEvents` struct.
+ * The maximum number of MIDI events in a single `VstEvents` struct. Apparently
+ * the Orchestral Tools Kontakt libraries output more than 2048 MIDI events per
+ * buffer, which sounds kinda intense, so hopefully this is enough.
  */
-constexpr size_t max_midi_events = max_buffer_size / sizeof(size_t);
+constexpr size_t max_midi_events = max_buffer_size;
 /**
  * The maximum size in bytes of a string or buffer passed through a void pointer
  * in one of the dispatch functions. This is used to create buffers for plugins