NeAtom is now an NeUInt and not a pointer.

This allows it to work correctly on 32-bit and 64-bit builds.
Fixed pop! in System.n
Tables.n uses new syntax.
Fixed bug in NeLess.
Fixed warnings in 64-bit builds.
Changed the format of loop.

Loop now accepts a number or a key/value first parameter. (loop 5 …) will loop 5 times.  (loop x:5 …) will loop 5 times and x will contain the count.
Huge refactor

Natives now return a boolean on success and use an output parameter for the result.

Also added NeLookUp.

NeCreateSymbol now uses -1 as size of self detection of length.