Move defines.h into utils, cleanup main_menu a bit. Add some items to pch fil. Add imgui defines for quicker access to imgui functions. Add cheat menu font to options, add credits.txt.
Add credits to user-grinch for the style used in readme and in the code. Disable dll test code.
Remove ImGui functions out of directx9_test.cpp. Move InitializeD3D into helpers.cpp
