Broaden a catch clause so Java Errors while loading plugins don't halt the proxy.

proxy/src/main/java/com/velocitypowered/proxy/plugin/VelocityPluginManager.java

@@ -76,7 +76,7 @@ public class VelocityPluginManager implements PluginManager {
 
             try {
                 pluginObject = loader.createPlugin(plugin);
-            } catch (Exception e) {
+            } catch (Throwable e) {
                 logger.error("Can't create plugin {}", plugin.getId(), e);
                 continue;
             }