All: rename every function from UpperCamelCase to snake_case

This was a mess since I didn't know which to use but now I decided
to go with snake_case :)

BAN/include/BAN/ForwardList.h

@@ -13,5 +13,6 @@ namespace BAN
 	class String;
 	class StringView;
 	template<typename> class Vector;
+	template<typename> class LinkedList;
 
 }