- Don't touch <fmt/std.h> because it touches std::filesystem which makes
macOS throw a hissy fit and refuse to compile.
- int_to_string is broken on macOS because it uses std::to_chars which
makes macos throw a hissy fit like a cranky old female cat seeing a
kitten if it sees it.
- wallet3 was using std::filesystem and std::visit, both of which make
macos throw a hissy fit. (There is a pattern here). Apply the dumb
fs::path and var::visit workarounds needed to appease this garbage OS.
- use var::get (from oxenc/variant.h) instead of std::get because, oh
yeah, we need to support a garbage OS that Apple themselves don't even
properly support. Yay!
Fixes a few merge conflicts, several compilation errors, and
some behavioral incorrectness. Still a few bugs with wallet3
but as far as I can tell wallet2 and daemon etc. should be working
correctly.
