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

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

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