- libpshost resolves the absolute path to the PowerShell binaries from
the environment variable PWRSH_ROOT
- libpshost assumes that PowerShell's AssemblyLoadContext.dll exists in
PWRSH_ROOT and loads during `startCoreCLR()`
- libicu is now only used by libpshost; note that an icu::UnicodeString
is UTF-16, and endianness does not matter (see
http://userguide.icu-project.org/strings#TOC-ICU:-16-bit-Unicode-strings)