Add tool executables to version control

- Update .gitignore to allow .exe files outside build directories
- Add bison.exe and flex.exe (ScriptEngine parser tools)
- Add dxsetup.exe (DirectX redistributable)
- Add GCMDSTools.exe utility
- Add zlib.dll dependency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -5,7 +5,16 @@
 *.ilk
 *.exp
 *.dll
-*.exe
+
+# Executable files only in build output directories
+[Dd]ebug/**/*.exe
+[Dd]ebug_MY/**/*.exe
+[Rr]elease/**/*.exe
+[Rr]elease_MY/**/*.exe
+[Rr]elease_NoGD/**/*.exe
+Executable/**/*.exe
+**/Executable/*.exe
+**/Executable/*.lib
 *.pch
 *.ipch
 *.suo