add replaceBlockType block/server callback

src/callbacks/block/server/_list.zig

@@ -1,3 +1,4 @@
 pub const checkSupportBlocks = @import("checkSupportBlocks.zig");
 pub const decay = @import("decay.zig");
 pub const replaceBlock = @import("replaceBlock.zig");
+pub const replaceBlockType = @import("replaceBlockType.zig");

src/callbacks/block/server/replaceBlockType.zig

@@ -0,0 +1,32 @@
+const std = @import("std");
+
+const main = @import("main");
+
+block: main.blocks.Block,
+
+pub fn init(zon: main.ZonElement) ?*@This() {
+	const result = main.worldArena.create(@This());
+	result.* = .{
+		.block = main.blocks.parseBlock(zon.get(?[]const u8, "block", null) orelse {
+			std.log.err("Missing field \"block\" for replaceBlockType event", .{});
+			return null;
+		}),
+	};
+	return result;
+}
+
+pub fn run(self: *@This(), params: main.callbacks.ServerBlockCallback.Params) main.callbacks.Result {
+	const wx = params.chunk.super.pos.wx + params.blockPos.x;
+	const wy = params.chunk.super.pos.wy + params.blockPos.y;
+	const wz = params.chunk.super.pos.wz + params.blockPos.z;
+
+	if (params.block.mode() != self.block.mode()) {
+		std.log.err("{s} cannot replace {s} as they have different rotation modes", .{self.block.id(), params.block.id()});
+		return .ignored;
+	}
+
+	self.block.data = params.block.data;
+
+	_ = main.server.world.?.cmpxchgBlock(wx, wy, wz, params.block, self.block);
+	return .handled;
+}