engine: remove czeror sequence parser

This file initially came from HLND, a Chinese GoldSrc recreation.
It turned out to be suspiciously close to the original version, down
to the comments and code style. We don't work with leaked sources here,
so remove it.

A proper parser should be reimplemented from ground-up, when we will
start working on CZDS support.

engine/common/common.c

@@ -22,7 +22,6 @@ GNU General Public License for more details.
 #include "const.h"
 #include "client.h"
 #include "library.h"
-#include "sequence.h"
 
 static const char *file_exts[] =
 {
@@ -1047,7 +1046,7 @@ void *GAME_EXPORT pfnSequenceGet( const char *fileName, const char *entryName )
 {
 	Msg( "Sequence_Get: file %s, entry %s\n", fileName, entryName );
 
-	return Sequence_Get( fileName, entryName );
+	return NULL;
 }
 
 /*
@@ -1061,7 +1060,7 @@ void *GAME_EXPORT pfnSequencePickSentence( const char *groupName, int pickMethod
 {
 	Msg( "Sequence_PickSentence: group %s, pickMethod %i\n", groupName, pickMethod );
 
-	return  Sequence_PickSentence( groupName, pickMethod, picked );
+	return NULL;
 
 }