Add stderr logging for exceptions in Rhubarb for Spine

VERSION.md

@@ -1,5 +1,9 @@
 # Version history
 
+## Unreleased
+
+* Internal errors in Rhubarb Lip Sync for Spine are logged to stderr
+
 ## Version 1.7.0
 
 * Integration with Spine animation software

extras/EsotericSoftwareSpine/src/main/kotlin/com/rhubarb_lip_sync/rhubarb_for_spine/AudioFileModel.kt

@@ -162,6 +162,8 @@ class AudioFileModel(
 				}
 			} catch (e: InterruptedException) {
 			} catch (e: Exception) {
+				e.printStackTrace(System.err);
+
 				Platform.runLater {
 					Alert(Alert.AlertType.ERROR).apply {
 						headerText = "Error performing lip sync for event '$eventName'."