Implements a mix of #3 and #7

Adds a preset command which can be used to see available presets
Adds preset filters which can be used to specify item sub-categories within a preset
Removes SWORD_SMITH and RANGED_SMITH, as those are replaced by the RANGED and SWORD filters
Adds a list of usable filters for each preset

src/main/java/net/knarcraft/blacksmith/command/PresetTabCompleter.java

@@ -0,0 +1,60 @@
+package net.knarcraft.blacksmith.command;
+
+import net.knarcraft.blacksmith.config.SmithPreset;
+import net.knarcraft.blacksmith.config.SmithPresetFilter;
+import net.knarcraft.blacksmith.util.TabCompletionHelper;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The tab-completer for the preset command
+ */
+public class PresetTabCompleter implements TabCompleter {
+
+    @Nullable
+    @Override
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label,
+                                      @NotNull String[] args) {
+        //Only one argument is expected
+        if (args.length > 1) {
+            return new ArrayList<>();
+        }
+        //If no preset has been fully matched, tab-complete for presets.
+        //If a preset has been fully matched, tab-complete for applicable filters
+
+        String input = args[0].toUpperCase().replace('-', '_');
+
+        List<String> completions = new ArrayList<>();
+        String filterString = "";
+
+        if (input.contains(":")) {
+            String[] parts = input.split(":");
+            input = parts[0];
+            filterString = parts.length > 1 ? parts[1] : "";
+        }
+
+        //Add tab-completions for all supported filters
+        try {
+            List<SmithPresetFilter> filters = SmithPreset.valueOf(input).getSupportedFilters();
+            for (SmithPresetFilter filter : filters) {
+                if (filterString.isEmpty() || filter.name().contains(filterString)) {
+                    completions.add(input + ":" + filter.name());
+                }
+            }
+        } catch (IllegalArgumentException ignored) {
+            /* An illegal argument exception here simply means that the user has typed an unrecognized smith preset.
+               This can be safely ignored, as it simply means no filter tab-completions are necessary. */
+        }
+
+        //Adds all default completions
+        completions.addAll(TabCompletionHelper.filterMatchingContains(SmithPreset.getPresetNames(), input));
+        return completions;
+    }
+
+}