optimize default insert_sorted implementation

add stupid default implementation for high level insertion sort

add default impl for some list member functions

fix inserting via iterator correctly increases element count

close feature branch feature/tree_add

merge feature/tree_add branch

rework cx_tree_add() API to allow insertion of edge nodes feature/tree_add

remove condition that is always false after recent fix feature/tree_add

fix cx_tree_search() not remembering root as a valid candidate feature/tree_add

cx_tree_add_iter() - optimize check for empty trees feature/tree_add

cx_tree_add() fix missing spec for adding duplicates feature/tree_add

complete cx_tree_add() implementations feature/tree_add

fix return type of cx_tree_node_create_func feature/tree_add

complete specification for tree_add functions feature/tree_add

(0) -300 -100 -14 +14 +100 tip

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