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

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