Fixed seemingly broken if statements in PrintStack

This looked broken, the Xcode analyzer complained about null-pointer dereferences.
Looked to me like the if branches should have been exclusive, i.e., else if branches.

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Tell the analyzer the obvious thing, now we reached zero-complains.

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Whitespace

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added #<< and #bitXor: primitives on Integer

for Mandelbrot benchmark

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Refactor lexer to prepare for new features

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Treat 'primitive' as normal identifier

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Parse only whole words as primitive keyword

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added parser support for Double literals

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Updated core-lib to latest version, including Mandelbrot benchmark

Signed-off-by: Stefan Marr <git@stefan-marr.de>