Apply the change from commit 454b47ba (VS: Fix MANIFESTUAC link flag
map to .vcxproj elements, 2018-11-21) to the v142 flag table.

Add special parsing of the flags given in `/MANIFESTUAC:"..."` in order
to map them correctly to `.vcxproj` elements.

Keep the old incorrect flag table entries for `uiAccess` and `level`
flags for compatibility even though they do not really exist.