Trying to fix make but still alot of bugs
operator<< has a forward declaration
added friend iterators
compiles
isFull(), and operator<<
added copy constructor to btree
move ctor implemented
steal function added, copy assignment operator
added move assignment operator
implemented isEmpty
find implemented, getPrevious node, changed btree_iterator signature
changing _map to <T,pair<T,btree>>
changed btree_iterator to work
iterator operator== and != added
added the lastNode so the structure doesnt break
added operator<< and insert
added move ctor
added copy ctor
btree has a swap function
bad move assignment implementation