Drop manual isEditable copy in CraftSign

Signs no longer have a specific isEdiable state, the entire API in this
regard needs updating/deprecation. The boolean field is completely gone,
replaced by a uuid (which will need a new setEditingPlayer(UUID) method
on the Sign interface), and the current upstream implementation of
setEdiable simply flips the is_waxed state.

This patch is hence not needed as it neither allows editing (which will
be redone in a later patch) nor is required to copy the is_waxed boolean
flag as it lives in the signs compound tag and is covered by applyTo.

patches/server/0914-Add-Sneaking-API-for-Entities.patch

@@ -0,0 +1,29 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: dawon <dawon@dawon.eu>
+Date: Wed, 19 Oct 2022 23:31:53 +0200
+Subject: [PATCH] Add Sneaking API for Entities
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+index b8550052bfde2b2b97fa4497e6e5d055e6161529..e7d311e94d637cabfd906f7021c4218f445915fe 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+@@ -1198,6 +1198,18 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
+         return Pose.values()[this.getHandle().getPose().ordinal()];
+     }
+ 
++    // Paper start
++    @Override
++    public void setSneaking(boolean sneak) {
++        this.getHandle().setShiftKeyDown(sneak);
++    }
++
++    @Override
++    public boolean isSneaking() {
++        return this.getHandle().isShiftKeyDown();
++    }
++    // Paper end
++
+     @Override
+     public SpawnCategory getSpawnCategory() {
+         return CraftSpawnCategory.toBukkit(this.getHandle().getType().getCategory());