PluginManager: try/catch Throwable all the plugin startup stuff

If you loaded an external plugin that throws LinkageErrors it could
cause the client not to start

runelite-client/src/main/java/net/runelite/client/externalplugins/ExternalPluginManager.java

@@ -305,7 +305,11 @@ public class ExternalPluginManager
 						});
 					}
 				}
-				catch (Exception e)
+				catch (ThreadDeath e)
+				{
+					throw e;
+				}
+				catch (Throwable e)
 				{
 					log.warn("Unable to start or load external plugin \"{}\"", manifest.getInternalName(), e);
 					if (newPlugins != null)

runelite-client/src/main/java/net/runelite/client/plugins/PluginManager.java

@@ -159,6 +159,8 @@ public class PluginManager
 	}
 
 	public Config getPluginConfigProxy(Plugin plugin)
+	{
+		try
 		{
 			final Injector injector = plugin.getInjector();
 
@@ -170,7 +172,15 @@ public class PluginManager
 					return (Config) injector.getInstance(key);
 				}
 			}
-
+		}
+		catch (ThreadDeath e)
+		{
+			throw e;
+		}
+		catch (Throwable e)
+		{
+			log.warn("Unable to get plugin config", e);
+		}
 		return null;
 	}
 
@@ -202,12 +212,23 @@ public class PluginManager
 	}
 
 	public void loadDefaultPluginConfiguration(Collection<Plugin> plugins)
+	{
+		try
 		{
 			for (Object config : getPluginConfigProxies(plugins))
 			{
 				configManager.setDefaultConfiguration(config, false);
 			}
 		}
+		catch (ThreadDeath e)
+		{
+			throw e;
+		}
+		catch (Throwable ex)
+		{
+			log.warn("Unable to reset plugin configuration", ex);
+		}
+	}
 
 	public void startPlugins()
 	{
@@ -367,7 +388,11 @@ public class PluginManager
 			schedule(plugin);
 			eventBus.post(new PluginChanged(plugin, true));
 		}
-		catch (Exception ex)
+		catch (ThreadDeath e)
+		{
+			throw e;
+		}
+		catch (Throwable ex)
 		{
 			throw new PluginInstantiationException(ex);
 		}
@@ -440,9 +465,13 @@ public class PluginManager
 		Plugin plugin;
 		try
 		{
-			plugin = clazz.newInstance();
+			plugin = clazz.getDeclaredConstructor().newInstance();
 		}
-		catch (InstantiationException | IllegalAccessException ex)
+		catch (ThreadDeath e)
+		{
+			throw e;
+		}
+		catch (Throwable ex)
 		{
 			throw new PluginInstantiationException(ex);
 		}