Send the VST2 transport info along with processing

And cache it during the processing cycle. This greatly reduces the
overhead of bridging VST2 plugins.

CHANGELOG.md

@@ -10,6 +10,15 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### Added
 
+- During VST2 audio processing calls, yabridge will now immediately send the
+  current transport information along with the audio buffers. This lets us cache
+  this information during the processing call, which significantly reduce the
+  overhead of bridging VST2 plugins by avoiding one otherwise mandatory back and
+  forth function call between yabridge's plugin and the Wine plugin host. This
+  has an even greater impact on plugins like _SWAM Cello_ that request this
+  information repeatedly for every sample they process. Previously yabridge had
+  a `cache_time_info` compatibility option to mitigate the performance hit for
+  those plugins, but this new caching behaviour supercedes that.
 - We now always force the CPU's flush-to-zero flag to be set when processing
   audio. Most plugins will already do this themselves, but plugins like _Kush
   Audio REDDI_ and _Expressive E Noisy_ that don't will otherwise suffer from