* Audit for "" and use std::string default ctor instead.
* Fix Linux ambiguity.
* Exclude common build directories.
* Replace CPPREST_TARGET_XP with checks against _WIN32_WINNT to allow more fine grained controls going forward (e.g. assume Win10).
Also fix a few typos.
* Delete CASABLANCA_UNREFERENCED_PARAMETER and attempt Linux compile fix.
* Defend NOMINMAX.
* Another _WIN32 guard.
* With && this time.
* Fix more spelling errors.
* Optimize trim_nulls slightly.
* And actually make the optimization correct this time.
* Fix unit test failure.
* clang-format
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