Protect Bedrock and End Portal/Frames from being destroyed

This fixes exploits that let players destroy bedrock by Pistons, explosions
and Mushrooom/Tree generation.

These blocks are designed to not be broken except by creative players/commands.
So protect them from a multitude of methods of destroying them.

A config is provided if you rather let players use these exploits, and let
them destroy the worlds End Portals and get on top of the nether easy.

paper-server/patches/sources/net/minecraft/world/level/Level.java.patch

@@ -344,7 +344,7 @@
 +        return chunk == null ? null : chunk.getFluidState(blockposition);
 +    }
 +
-     @Override
++    @Override
 +    public final boolean hasChunkAt(BlockPos pos) {
 +        return getChunkIfLoaded(pos.getX() >> 4, pos.getZ() >> 4) != null; // Paper - Perf: Optimize Level.hasChunkAt(BlockPosition)Z
 +    }
@@ -365,18 +365,22 @@
 +        return getWorldBorder().isWithinBounds(blockposition) ? getBlockStateIfLoaded(blockposition) : null;
 +    }
 +
-+    @Override
+     @Override
      public ChunkAccess getChunk(int chunkX, int chunkZ, ChunkStatus leastStatus, boolean create) {
 +        // Paper end
          ChunkAccess ichunkaccess = this.getChunkSource().getChunk(chunkX, chunkZ, leastStatus, create);
  
          if (ichunkaccess == null && create) {
-@@ -207,6 +444,18 @@
+@@ -207,6 +444,22 @@
  
      @Override
      public boolean setBlock(BlockPos pos, BlockState state, int flags, int maxUpdateDepth) {
 +        // CraftBukkit start - tree generation
 +        if (this.captureTreeGeneration) {
++            // Paper start - Protect Bedrock and End Portal/Frames from being destroyed
++            BlockState type = getBlockState(pos);
++            if (!type.isDestroyable()) return false;
++            // Paper end - Protect Bedrock and End Portal/Frames from being destroyed
 +            CraftBlockState blockstate = this.capturedBlockStates.get(pos);
 +            if (blockstate == null) {
 +                blockstate = CapturedBlockState.getTreeBlockState(this, pos, flags);
@@ -390,7 +394,7 @@
          if (this.isOutsideBuildHeight(pos)) {
              return false;
          } else if (!this.isClientSide && this.isDebug()) {
-@@ -214,45 +463,126 @@
+@@ -214,45 +467,126 @@
          } else {
              LevelChunk chunk = this.getChunkAt(pos);
              Block block = state.getBlock();
@@ -532,7 +536,7 @@
      public void onBlockStateChange(BlockPos pos, BlockState oldBlock, BlockState newBlock) {}
  
      @Override
-@@ -270,15 +600,33 @@
+@@ -270,15 +604,33 @@
              return false;
          } else {
              FluidState fluid = this.getFluidState(pos);
@@ -569,7 +573,7 @@
              }
  
              boolean flag1 = this.setBlock(pos, fluid.createLegacyBlock(), 3, maxUpdateDepth);
-@@ -340,10 +688,18 @@
+@@ -340,10 +692,18 @@
  
      @Override
      public BlockState getBlockState(BlockPos pos) {
@@ -589,7 +593,7 @@
  
              return chunk.getBlockState(pos);
          }
-@@ -446,34 +802,53 @@
+@@ -446,34 +806,53 @@
              this.pendingBlockEntityTickers.clear();
          }
  
@@ -641,18 +645,18 @@
 +            entity.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.DISCARD);
 +            // Paper end - Prevent block entity and entity crashes
          }
-     }
++    }
 +    // Paper start - Option to prevent armor stands from doing entity lookups
 +    @Override
 +    public boolean noCollision(@Nullable Entity entity, AABB box) {
 +        if (entity instanceof net.minecraft.world.entity.decoration.ArmorStand && !entity.level().paperConfig().entities.armorStands.doCollisionEntityLookups) return false;
 +        return LevelAccessor.super.noCollision(entity, box);
-+    }
+     }
 +    // Paper end - Option to prevent armor stands from doing entity lookups
  
      public boolean shouldTickDeath(Entity entity) {
          return true;
-@@ -510,13 +885,32 @@
+@@ -510,13 +889,32 @@
      @Nullable
      @Override
      public BlockEntity getBlockEntity(BlockPos pos) {
@@ -686,7 +690,7 @@
              this.getChunkAt(blockposition).addAndRegisterBlockEntity(blockEntity);
          }
      }
-@@ -643,7 +1037,7 @@
+@@ -643,7 +1041,7 @@
  
                  for (int k = 0; k < j; ++k) {
                      EnderDragonPart entitycomplexpart = aentitycomplexpart[k];
@@ -695,7 +699,7 @@
  
                      if (t0 != null && predicate.test(t0)) {
                          result.add(t0);
-@@ -912,7 +1306,7 @@
+@@ -912,7 +1310,7 @@
  
      public static enum ExplosionInteraction implements StringRepresentable {