* Current develop spack.bat file cannot handle any reserved characters
being passed via the CLI, particularly '=' and '?'. To address this,
re-do the CLI parsing for loop to use custom logic to allow for more
granular handling of CLI args.
* We take a less-than-ideal approach to escaping local scope and
handling unset variables as well as the actual parsing of CL
arguments. To address this, don't quote the args and then try to
parse the quotes we just added (resulting in spack flags being
undefined). Instead, leverage batch script features. Since we are
not unnecessarily quoting things, we don't need to think about
removing them, and in the case of paths with spaces, we should _not_
be removing the quotes as we currently do.
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