Refactor required files (#511)

* Remove `gamemd.exe`, `theme.mix`, `thememd.mix` from required files

* Add executables that important to launch campaign missions

Author: MahBoiDeveloper

package/Resources/ClientDefinitions.ini

@@ -14,7 +14,7 @@ MPMapsPath=INI\MPMaps.ini
 LoadingScreenCount=0
 LongGameName=Yuri's Revenge
 LocalGame=YR
-RequiredFiles=gamemd.exe,ra2.mix,ra2md.mix,langmd.mix,language.mix,theme.mix,thememd.mix,BINKW32.DLL,Blowfish.dll
+RequiredFiles=ra2.mix,ra2md.mix,langmd.mix,language.mix,BINKW32.DLL,Blowfish.dll,gamemd.exe,ra2.exe,ra2mdlauncher.exe
 RegistryInstallPath=YurisRevenge
 CnCNetLiveStatusIdentifier=cncnet5_yr
 CreditsURL=http://www.moddb.com/mods/the-dawn-of-the-tiberium-age/tutorials/credits