assertions

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Remove string duplication (search binary with string utility to find out how much space you can save)
Use integer error codes rather than showing error strings
Literal pool usage reduction
- e.g. when going from ARM to Thumb
- group globals into structures
.sinit usage (construct instead simple global structs)
selectively enable optimization for some files
refactoring duplicate code
reduce usage of standard library functions

#define ASSERT(expr) \
  if (expr) \
      {} \
  else \
      aFailed(F_NUM, __LINE__)