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

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

src/Generating/ChunkGenerator.cpp

@@ -282,6 +282,7 @@ void cChunkGenerator::Execute(void)
 
 
 
+
 void cChunkGenerator::DoGenerate(int a_ChunkX, int a_ChunkZ)
 {
 	ASSERT(m_PluginInterface != nullptr);