* rename -- remove preview directory. Fix up associated project files that used relative paths to remove one directory (..\)
ClickOnceWrapper had a problem, in that its dependson was pre-run instead of pre-build, which means it had to have run successfully already; this was fixed.
* fixup of project files
* update paths referenced in README.md
* update CODEOWNERS and root README.md to point to MSIXCore README.md
wcheng-msft