GH-1047 parse world files and integrate MCEdit with world page

depends/libnbtplusplus/README.md

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+# libnbt++ 2 (WIP)
+
+libnbt++ is a free C++ library for Minecraft's file format Named Binary Tag
+(NBT). It can read and write compressed and uncompressed NBT files and
+provides a code interface for working with NBT data.
+
+----------
+
+libnbt++2 is a remake of the old libnbt++ library with the goal of making it
+more easily usable and fixing some problems. The old libnbt++ especially
+suffered from a very convoluted syntax and boilerplate code needed to work
+with NBT data.
+
+
+Forked from https://github.com/ljfa-ag/libnbtplusplus at commit 3b7d44aa0b84f9c208d906f4d10517e36220ee80