Adds orc_rt::CommandLineParser, a small header-only option parser in
orc-rt-utils for use by orc-rt tools that need argument handling.
Features:
- Long (--name, --name=value) and short (-n, -nvalue) options.
- Short-flag clustering (e.g. -vp9999) and "--" to terminate option
parsing, with remaining tokens collected as positionals.
- Typed values, with parse failures returning an orc_rt::Error.
- printHelp() with aligned, optionally short-name-aware output.
Values are bound to caller-owned storage supplied at registration time and
reset to their defaults on each parse().
Also adds CommandLineTest.cpp to the CoreTests unittest and fixes the
indentation of the docs subdirectory guard in orc-rt/CMakeLists.txt.
Jared Wyles
76066e5867