add visit_on_exit to iterator implementation

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

add code documentation for tree functions

update uwproj configure template

remove check that is always true in cx_arl_remove()

rename cx_array_copy_result to just cx_array_result

add cx_array_add() + fix type of cx_array_default_reallocator

add cx_array_default_reallocator

add first basic low level tree functions

update uwproj and check toolchain dependency for coverage flags - fixes #345

fix using warning options with compilers which do not support them - fixes #363

improve program flow - relates to #353

fix unnecessary printf retry when printed string is empty

fix missing va_end() calls

add cx_sprintf() variants - fixes #353

fix assertion failure depending on possibly uninitialized memory

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