Fix fabric command issues:

- Made only players support chat events
- Added hashcode and equals needed for storing in cache (Confirmation uses CMDSender as key)
- Hacky fix for running tasks when plugin is disabled

Affects issues:
- Fixed #2183

Plan/fabric/src/main/java/net/playeranalytics/plan/gathering/listeners/events/mixin/ServerCommandSourceMixin.java

@@ -41,7 +41,7 @@ public abstract class ServerCommandSourceMixin implements CMDSender {
 
     @Override
     public boolean supportsChatEvents() {
-        return true;
+        return isPlayer();
     }
 
     @Shadow
@@ -68,7 +68,7 @@ public abstract class ServerCommandSourceMixin implements CMDSender {
 
     @Override
     public Optional<UUID> getUUID() {
-        return Optional.ofNullable(isConsole() ? null : getEntity().getUuid());
+        return getPlayer().map(Entity::getUuid);
     }
 
     @Override
@@ -91,4 +91,17 @@ public abstract class ServerCommandSourceMixin implements CMDSender {
         }
         return Optional.empty();
     }
+
+    @Override
+    public int hashCode() {
+        return Boolean.hashCode(isConsole()) + getUUID().hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof ServerCommandSourceMixin other)) return false;
+
+        return isConsole() == other.isConsole()
+                && getUUID().equals(other.getUUID());
+    }
 }

Plan/fabric/src/main/java/net/playeranalytics/plugin/scheduling/FabricRunnableFactory.java

@@ -24,7 +24,7 @@ import java.util.concurrent.ScheduledExecutorService;
 
 public class FabricRunnableFactory implements RunnableFactory {
 
-    private final ScheduledExecutorService executorService;
+    private ScheduledExecutorService executorService;
     private final Set<FabricTask> tasks;
 
     public FabricRunnableFactory() {
@@ -34,13 +34,21 @@ public class FabricRunnableFactory implements RunnableFactory {
 
     @Override
     public UnscheduledTask create(Runnable runnable) {
-        return new UnscheduledFabricTask(executorService, runnable, task -> {
+        return new UnscheduledFabricTask(getExecutorService(), runnable, task -> {
         });
     }
 
+    private ScheduledExecutorService getExecutorService() {
+        if (executorService.isShutdown() || executorService.isTerminated()) {
+            // Hacky way of fixing tasks when plugin is disabled, leaks one thread every reload.
+            executorService = Executors.newSingleThreadScheduledExecutor();
+        }
+        return executorService;
+    }
+
     @Override
     public UnscheduledTask create(PluginRunnable runnable) {
-        return new UnscheduledFabricTask(executorService, runnable, runnable::setCancellable);
+        return new UnscheduledFabricTask(getExecutorService(), runnable, runnable::setCancellable);
     }
 
     @Override