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b167d61615
Don't use variable length array and remove `debugSend_P`, directly give the format to `vsnprintf_P`.
Common functions moved into namespace debug { ... }
Module functions moved into namespace { ... }
Provide len argument to most outputs, so it's calculated exactly once.
Early checks for nullptr and zero length.
Fix include order once again, try not to depend on config in header and
only use it in the actual .cpp code.
Still involves strlen for flash strings, but that needs to be addressed by using a custom type like:
```
struct PstrWithLength {
const char* const ptr;
size_t size;
};
```
And define PSTR macro to return:
```
PstrWithLength{&__pstr__[0], sizeof(__pstr__)};`
```
(and, probably, for any `const char (&fixed)[Size]` arrays as well)