rename GetClassName/IsClass, declare mxtypes

Was intended as a simple code improvement, however it also seems to make WinMain, MxString::operator=, MxDSFile::Open 100% (all of which just needed registers to be switched around)

LEGO1/mxvideomanager.cpp

@@ -14,7 +14,7 @@ int MxVideoManager::Init()
   this->m_unk58 = NULL;
   this->m_unk5c = 0;
   this->m_videoParam.SetPalette(NULL);
-  this->m_unk60 = MX_FALSE;
+  this->m_unk60 = FALSE;
   return 0;
 }
 
@@ -33,4 +33,4 @@ long MxVideoManager::RealizePalette(MxPalette *p_palette)
 
   this->m_criticalSection.Leave();
   return 0;
-}
+}