Fix For "could Not Locate Texture: Null,origin,trigger,ffield

This issue comes up from time to time. So i decided to finally submit a patch for it. This is a rather simple change at the top of Interior::prepForRendering() in interior.cc:

bool Interior::prepForRendering(const char* path)
{
   if (mPreppedForRender == true)
      return true;

   // Before we load the material list we temporarily remove
   // some special texture names so that we don't get bogus
   // texture load warnings in the console.
   VectorPtr<char*> MatNames;
   MatNames = mMaterialList->mMaterialNames;
   VectorPtr<char*>::iterator iter = mMaterialList->mMaterialNames.begin();
   for ( ; iter != mMaterialList->mMaterialNames.end(); iter++ ) 
   {
      if ( *iter && 
            (  dStrcmp( *iter, "NULL" ) == 0 ||
               dStrcmp( *iter, "ORIGIN" ) == 0 ||
               dStrcmp( *iter, "TRIGGER" ) == 0 ||
               dStrcmp( *iter, "FORCEFIELD" ) == 0 ) )
      {
         *iter = NULL;
      }
   }

   // Load the material list
   bool matListSuccess = mMaterialList->load(InteriorTexture, path, false);

   // Now restore the material names since someone later may
   // count on the special texture names being present.
   mMaterialList->mMaterialNames = MatNames;

   // REST OF FUNCTION

I tested it in 1.4 RC1 and it seems to work perfectly. I think this issue was fixed in TSE in a different way already, so it probably doesn't apply there.