CheckBasicStyle: Check number of empty lines between functions (#4267)

Add check for number of empty lines between functions and fix the corresponding failures

src/ChunkData.cpp

@@ -575,6 +575,7 @@ void cChunkData::SetBlockTypes(const BLOCKTYPE * a_Src)
 
 
 
+
 void cChunkData::SetMetas(const NIBBLETYPE * a_Src)
 {
 	ASSERT(a_Src != nullptr);
@@ -643,6 +644,7 @@ void cChunkData::SetBlockLight(const NIBBLETYPE * a_Src)
 
 
 
+
 void cChunkData::SetSkyLight(const NIBBLETYPE * a_Src)
 {
 	if (a_Src == nullptr)