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

add missing CHANGELOG entries

remove flags to disable SBO in tests - fix #343 fix #358

add constant for reading out strstr sbo size - relates to #343

add constant for reading out printf sbo size - relates to #343

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