…t (IsDigit, ToLower) in {Format,Parse}Money(...), uint256::SetHex(...), etc. Remove the use of locale dependent boost::is_space(...)

8931a95 Include util/strencodings.h which is required for IsSpace(...) (practicalswift)
7c9f790 Update KNOWN_VIOLATIONS: Remove fixed violations (practicalswift)
587924f Use IsSpace(...) instead of boost::is_space (practicalswift)
c5fd143 Use ToLower(...) instead of std::tolower (practicalswift)
e70cc89 Use IsDigit(...) instead of std::isdigit (practicalswift)

Pull request description:

  * Use `ToLower(...)` instead of `std::tolower`. `std::tolower` is locale dependent.
  * Use `IsDigit(...)` instead of `std::isdigit`. Some implementations (e.g. Microsoft in 1252 codepage) may classify single-byte characters other than `[0-9]` as digits.
  * Update `KNOWN_VIOLATIONS`: Remove fixed violations.
  * ~~Replace use of locale dependent Boost trim (`boost::trim`) with locale independent `TrimString`.~~
  * Use` IsSpace(...)` instead of `boost::is_space`

Tree-SHA512: defed016136b530b723fa185afdbd00410925a748856ba3afa4cee60f61a67617e30f304f2b9991a67b5fe075d9624f051e14342aee176f45fbc024d59e1aa82

Use locale-agnostic IsSpace and ToLower instead of std::isspace and
std::tolower.

Signed-off-by: Dzutte <[email protected]>