Merge #17280: refactor: Change occurences of c_str() used with size() to data()

f3b51eb9352d7a7c5dfa15615efc8bc0a52ffecf Fix occurences of c_str() used with size() to data() (Wladimir J. van der Laan)

Pull request description:

  Using `data()` better communicates the intent here.

  ~~Also, depending on how `c_str()` is implemented, this fixes undefined behavior: The part of the string after the first NULL character might have undefined contents (or even be inaccessible, worst case).~~ Apparently [this is no longer an issue with C++11](https://github.com/bitcoin/bitcoin/pull/17281#discussion_r339742128).

ACKs for top commit:
  fjahr:
    Code review ACK f3b51eb
  practicalswift:
    ACK f3b51eb9352d7a7c5dfa15615efc8bc0a52ffecf -- diff looks correct, `data()` more idiomatic
  ryanofsky:
    Code review ACK f3b51eb9352d7a7c5dfa15615efc8bc0a52ffecf. Most of these calls (including one in crypter.cpp) are passing text strings, not binary strings likely to contain `\0` and were probably safe before, but much better to avoid the possibility of bugs like this.

Tree-SHA512: 842e1bdd37efc4ece2ecb87ca34962aafef0a192180051def630607e349dc9c8b4e562481fff3de474515f493b4ee3ea53b00269a801a66e625326a38dfce5b8

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