Fix lemon invocation to refer to the built products directory.
For now, don't build the help bundle for snapshots.

I need to figure out how to get that building in a way that doesn't require
external dependencies if possible; until then, let's not worry about it.
Fix some remaining issues with the info.plist version setting script.
Miscellaneous remaining build issues.
Fix reference to SUUpdater header.

Some weird include path issues were going on, hopefully this'll be the last of
them.