ci: Update the CI scripts

Apply the following changes:
 * Update CI_BUILDDIR and CI_INSTALLDIR to reflect the new script
   names.
 * Introduce CI_SRCDIR_FROM_BUILDDIR and CI_INSTALLDIR_FROM_BUILDDIR
   to the cmake build, to ensure that the Windows tools can handle
   native Windows paths correctly when executed via Bash-on-Windows.
 * Stop guessing and using CI_SRCDIR_NATIVE and CI_INSTALLDIR_NATIVE
   in the cmake build, since we now have a better solution.
 * Show the ninja program version in ninja-based cmake builds.
 * Move the cleanup of previous builds into separate functions, and
   do it in a cleaner manner. No pun intended.

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