feat: correctly apply keyed attribute modifiers, close #326

We need to construct attributes with their key if possible to avoid stacking. Uses reflection :( to do this.

Also adds a bit of error checking to health scale syncing

gradle.properties

@@ -3,7 +3,7 @@ org.gradle.jvmargs='-Dfile.encoding=UTF-8'
 org.gradle.daemon=true
 javaVersion=17
 
-plugin_version=3.6.3
+plugin_version=3.6.4
 plugin_archive=husksync
 plugin_description=A modern, cross-server player data synchronization system