refactor: drop lolib, add own scheduler, inventory GUI and void generator

src/main/java/dev/loki/loparkour/scheduler/BukkitBackend.java

@@ -0,0 +1,36 @@
+package dev.loki.loparkour.scheduler;
+
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
+
+/**
+ * Scheduler backend for Bukkit/Paper servers.
+ */
+final class BukkitBackend implements Scheduler.Backend {
+
+    private final Plugin plugin;
+
+    BukkitBackend(Plugin plugin) {
+        this.plugin = plugin;
+    }
+
+    @Override
+    public ScheduledTask run(Runnable task) {
+        return Bukkit.getScheduler().runTask(plugin, task)::cancel;
+    }
+
+    @Override
+    public ScheduledTask runAsync(Runnable task) {
+        return Bukkit.getScheduler().runTaskAsynchronously(plugin, task)::cancel;
+    }
+
+    @Override
+    public ScheduledTask runLater(Runnable task, long delayTicks) {
+        return Bukkit.getScheduler().runTaskLater(plugin, task, delayTicks)::cancel;
+    }
+
+    @Override
+    public ScheduledTask runTimer(Runnable task, long delayTicks, long periodTicks) {
+        return Bukkit.getScheduler().runTaskTimer(plugin, task, delayTicks, periodTicks)::cancel;
+    }
+}