tweak(ini): Improve consistency in use of INI::getNextTokenOrNull

[Caball009]

• (Rebase and) Merge after PR refactor(ini): Make the INI code cleaner and more consistent #2596

This PR contains two changes that may change behavior:

1. for (const char* token = ini->getNextToken(); token; token = ini->getNextTokenOrNull()) ->
   for (const char* token = ini->getNextTokenOrNull(); token; token = ini->getNextTokenOrNull())

2. GeneralsGameCode/GeneralsMD/Code/GameEngine/Source/GameLogic/Object/ObjectCreationList.cpp

   Lines 1439 to 1449 in 4de60c2

   	static void parseDebrisObjectNames( INI* ini, void *instance, void *store, const void* /*userData*/ )
   	{
   	GenericObjectCreationNugget* debrisNugget = (GenericObjectCreationNugget*)instance;
   	for (const char* debrisName = ini->getNextToken(); debrisName; debrisName = ini->getNextTokenOrNull())
   	{
   	if (TheGlobalData->m_preloadAssets)
   	debrisModelNamesGlobalHack.push_back(debrisName);
   	debrisNugget->m_names.push_back(AsciiString(debrisName));
   	debrisName = ini->getNextTokenOrNull();
   	}
   	}

   
   Line 1447 is unnecessary / undesirable.

Note on the first change

WRT the first change, it's not possible to have all loops match this format:
for (const char* token = ini->getNextToken(); token; token = ini->getNextTokenOrNull()) because some lines in the standard ini files are incomplete and so the token may be empty. I came across two types of incomplete lines:

https://github.com/TheSuperHackers/GeneralsGamePatch/blob/5845293dd12ab10c5f16c6f3116ce526f62dc369/Patch104pZH/GameFilesOriginalZH/Data/INI/SoundEffects.ini#L333

https://github.com/TheSuperHackers/GeneralsGamePatch/blob/5845293dd12ab10c5f16c6f3116ce526f62dc369/Patch104pZH/GameFilesOriginalZH/Data/INI/Object/ChemicalGeneral.ini#L10693

GeneralsGameCode/Core/GameEngine/Source/Common/INI/INI.cpp

Lines 1871 to 1872 in 4de60c2

	const char *c = ini->getNextTokenOrNull(SEPS);
	while ( c )

GeneralsGameCode/GeneralsMD/Code/GameEngine/Include/Common/BitFlagsIO.h

Line 70 in 4de60c2

for (const char *token = ini->getNextTokenOrNull(); token != nullptr; token = ini->getNextTokenOrNull())