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

add CX_DISABLE_ARRAY_LIST_SWAP_SBO flag

complete migration of list tests - fixes #342

(0) -300 -100 -10 +10 +100 tip

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