docs(vendor): add version.txt tracking files for imgui, llvm, raylib, and rlImGui

vendor/imgui/version.txt

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+Name: Dear ImGui
+Version: 1.93.0 WIP (Docking)
+VersionNum: 19297
+Branch: docking
+Repository: https://github.com/ocornut/imgui
+Commit/Release: v1.93.0-docking-wip
+License: MIT
+Integration: Compiled via single translation unit vendor/imgui/vendor_imgui.cpp (cached in build/vendor_imgui.obj)

vendor/llvm/version.txt

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+Name: LLVM / libclang
+Version: 19.1.0
+CIndexVersion: 0.64
+Target: x86_64-pc-windows-msvc
+Repository: https://github.com/llvm/llvm-project
+License: Apache-2.0 with LLVM Exception
+Binaries:
+  - vendor/llvm/lib/libclang.lib (x64 import library)
+  - build/libclang.dll (runtime shared library copied from LLVM 19.1.0)
+Headers:
+  - vendor/llvm/include/clang-c/ (libclang C indexing API)

vendor/raylib/version.txt

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+Name: raylib
+Version: 5.0
+Platform: Windows x64 MSVC
+Repository: https://github.com/raysan5/raylib
+Website: https://www.raylib.com
+License: zlib/libpng
+Binaries:
+  - vendor/raylib/lib/raylib.lib (static library for MSVC x64)
+Headers:
+  - vendor/raylib/include/raylib.h
+  - vendor/raylib/include/raymath.h
+  - vendor/raylib/include/rlgl.h

vendor/rlImGui/version.txt

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+Name: rlImGui
+Version: raylib 5.0 + Dear ImGui Docking integration
+Repository: https://github.com/raylib-extras/rlImGui
+Author: Jeffery Myers
+License: zlib
+Integration: Compiled via vendor/rlImGui/rlImGui.cpp (cached in build/rlImGui.obj)
+Headers:
+  - vendor/rlImGui/rlImGui.h
+  - vendor/rlImGui/rlImGuiColors.h