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/0606-Move-range-check-for-block-placing-up.patch

@@ -1,22 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Nassim Jahnke <nassim@njahnke.dev>
-Date: Wed, 8 Jun 2022 10:52:18 +0200
-Subject: [PATCH] Move range check for block placing up
-
-
-diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
-index e51527e1ecf49160130434ffdf97a9a0563be353..842df6735485e9a809f397b32c14500523ec4ae8 100644
---- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
-+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
-@@ -1812,6 +1812,11 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
-         if (itemstack.isItemEnabled(worldserver.enabledFeatures())) {
-             BlockHitResult movingobjectpositionblock = packet.getHitResult();
-             Vec3 vec3d = movingobjectpositionblock.getLocation();
-+            // Paper start - improve distance check
-+            if (!Double.isFinite(vec3d.x) || !Double.isFinite(vec3d.y) || !Double.isFinite(vec3d.z)) {
-+                return;
-+            }
-+            // Paper end
-             BlockPos blockposition = movingobjectpositionblock.getBlockPos();
-             Vec3 vec3d1 = Vec3.atCenterOf(blockposition);
-