add depth assertion to basic tree iterator test

implement basic (enter only) tree iterator

set tree iterator stack pointer to NULL on dispose to avoid accidental double-frees

capitalize cx_array_declare()

vastly simplify tree iterators and add test for creating them

make cx_array_simple_add() automatically take the address of the element

add convenience macros for cx_array_*

commit complicated stuff before simplifying it

remove unnecessary flag_removal function

improve tree iterator struct and add signature for a function that can create an iterator

first draft of a tree iterator

add cx_tree_search() - relates to #165

be honest at least in the lib version

fix missing typedef

declare cx_tree_search_func function pointer

(0) -300 -100 -15 +15 +100 tip

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