adding plx::Globals

Our version of singletons. Need to be created all at start.
adding __try and __except to plex

it was bombing without them.

todo: rebase conformance tests.
fix globals

the array had __line__ which was a humongous number when moved to the
pch.
add contains method to ItRange
adding plx::VehManager (part 1)

the vectored exception handler.