Minor tweaks to GenericConfig & ContextProvider

# Changes:
- Changed Configuration#getList(String, Class) to Configuration#getCollection(String, Class)

- Renamed GenericConfiguration -> GenericConfig

- Implemented semantics for GenericConfig#getCollection and GenericConfig#getStringList

- Adjusted return value of ContextProvider#fromString to return Optional<T> instead of @Nullable T

- Adjusted classes which used previous API methods to use the newly updated ones.

Veritas/src/main/java/fns/veritas/Aggregate.java

@@ -28,6 +28,7 @@ import fns.veritas.bukkit.BukkitNative;
 import fns.veritas.bukkit.ServerListener;
 import fns.veritas.client.BotClient;
 import fns.veritas.client.BotConfig;
+import java.io.IOException;
 import org.bukkit.Bukkit;
 
 public class Aggregate
@@ -40,13 +41,30 @@ public class Aggregate
 
     public Aggregate(final Veritas plugin)
     {
+        BotClient bot1;
         this.plugin = plugin;
-        this.bot = new BotClient(new BotConfig(plugin));
+
+        try
+        {
+            bot1 = new BotClient(new BotConfig(plugin));
+        }
+        catch (IOException ex)
+        {
+            getLogger().error("Failed to load bot config! Shutting down...");
+            getLogger().error(ex);
+            this.bot = null;
+            this.serverListener = null;
+            this.bukkitNativeListener = null;
+            Bukkit.getPluginManager().disablePlugin(plugin);
+            return;
+        }
+
         this.bukkitNativeListener = new BukkitNative(plugin);
         this.serverListener = new ServerListener(plugin);
 
         Bukkit.getServer().getPluginManager().registerEvents(this.getBukkitNativeListener(), plugin);
         this.getServerListener().minecraftChatBound().subscribe();
+        this.bot = bot1;
     }
 
     public static FNS4J getLogger()

Veritas/src/main/java/fns/veritas/client/BotConfig.java

@@ -24,7 +24,8 @@
 package fns.veritas.client;
 
 import discord4j.common.util.Snowflake;
-import fns.patchwork.config.WrappedBukkitConfiguration;
+import fns.patchwork.config.ConfigType;
+import fns.patchwork.config.GenericConfig;
 import fns.veritas.Aggregate;
 import fns.veritas.Veritas;
 import java.io.File;
@@ -41,12 +42,11 @@ public class BotConfig
     public static final String GUILD_ID = "guild_id";
     @NonNls
     private static final String BOT_TOKEN = "bot_token";
-    private final WrappedBukkitConfiguration config;
+    private final GenericConfig config;
 
-    public BotConfig(final Veritas plugin)
+    public BotConfig(final Veritas plugin) throws IOException
     {
-        this.config = new WrappedBukkitConfiguration(f0(plugin),
-                                                     new File(plugin.getDataFolder(), "config.yml"));
+        this.config = new GenericConfig(ConfigType.TOML, plugin, "config.toml");
     }
 
     public String getToken()