Addition of Nix flake development shell (#4184)

* Initial devshell creation.

* cmake has a check for clang and therefore override the stdenv.

* Packages from old shell were renamed.

* fixed xcb-util, added libglvnd

* Added sdl3 dependencies provided by the website given on cmake configuration.

* Lock file.

* Nix format.

* Added instructions for entering nix development shell.

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* Added libuuid

* Added copyright text to flake.nix

* Added flake.lock to REUSE.toml as is a JSON file without comment support.

* Updated instructions to refer to new build name.

* Compiling however not yet correctly linking with debug derivation.

* Hitting installPhase

* Added nix result symlink.

* correctly installs in place

* Added a wrapper to load vulkan and ligl into environment.

* Ensure that the name is applicable to the current project.

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* Added mesa to LD_LIBRARY_PATH

* game now launching with added X11 libraries.

* Cleanup

Formatting.

Pulled cmakeFlags to top and added releaseWithDebugInfo

Removed LD_LIBRARY_PATH from devshell.

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* Added options for the different Nix build modes.

* Debug / release mode flag cannot be bundled into one.

REUSE.toml

@@ -22,6 +22,7 @@ path = [
     "documents/Screenshots/Linux/*",
     "documents/Screenshots/Windows/*",
     "externals/MoltenVK/MoltenVK_icd.json",
+    "flake.lock",
     "scripts/ps4_names.txt",
     "src/images/bronze.png",
     "src/images/gold.png",
@@ -130,4 +131,4 @@ SPDX-License-Identifier = "MIT"
 [[annotations]]
 path = "src/video_core/host_shaders/fsr/*"
 SPDX-FileCopyrightText = "Copyright (c) 2021 Advanced Micro Devices, Inc. All rights reserved."
-SPDX-License-Identifier = "MIT"
+SPDX-License-Identifier = "MIT"