docs: Split off 3rd party software acks. to dedicated file

3RDPARTY.md

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+# 3rd Party Software Acknowledgments
+
+The Limine project depends on several other projects which are pulled in by the
+./bootstrap script, or, in the case of release tarballs, are shipped alongside
+the core Limine code in the tarballs themselves, similar to ./bootstrap having
+been already run.
+
+These additional projects are NOT covered by the License as present inside the
+COPYING file, but are instead licensed as described by each individual
+project's documentation present in the project's dedicated subdirectory or
+license header(s).
+
+A non-binding, informal summary of all projects Limine depends on, and the
+licenses used by said projects, in SPDX format where possible, is as follows:
+
+- [cc-runtime](https://github.com/osdev0/cc-runtime)
+(Apache-2.0 WITH LLVM-exception) is used to provide runtime libgcc-like
+routines.
+
+- [0BSD Freestanding C Headers](https://github.com/osdev0/freestnd-c-hdrs-0bsd)
+(0BSD) provide GCC and Clang compatible freestanding C headers.
+
+- [Nyu-EFI](https://github.com/osdev0/nyu-efi) (multiple licenses, see list
+below) provides headers and build-time support for UEFI.
+    - BSD-2-Clause
+    - BSD-2-Clause-Patent
+    - BSD-3-Clause
+    - BSD-2-Clause no disclaimer Unmod
+(https://scancode-licensedb.aboutcode.org/bsd-no-disclaimer-unmodified.html)
+    - MIT
+
+- [tinf](https://github.com/jibsen/tinf) (Zlib) is used in early x86 BIOS
+stages for GZIP decompression of stage2.
+
+- [Flanterm](https://github.com/mintsuki/flanterm) (BSD-2-Clause) is used for
+text related screen drawing.
+
+- [stb_image](https://github.com/nothings/stb/blob/master/stb_image.h) (MIT) is
+used for wallpaper image loading.
+
+- [libfdt](https://git.kernel.org/pub/scm/utils/dtc/dtc.git) (BSD-2-Clause) is
+used for manipulating Flat Device Trees.
+
+Note that some of these projects, or parts of them, are provided under
+dual-licensing, in which case, in the above list, the only license mentioned is
+the one chosen by the Limine developers. Refer to each individual project's
+documentation for details.