move builtins to stdlib layout

[Flipez]

Signed-off-by: Flipez code@brauser.io

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[codecov-commenter]

Codecov Report

Merging #28 (a51553e) into master (7574adc) will increase coverage by 0.14%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   71.62%   71.76%   +0.14%     
==========================================
  Files          20       25       +5     
  Lines        1991     2001      +10     
==========================================
+ Hits         1426     1436      +10     
  Misses        511      511              
  Partials       54       54              

Impacted Files	Coverage Δ
object/builtin.go	33.33% <ø> (ø)
stdlib/exit.go	70.00% <70.00%> (ø)
stdlib/raise.go	71.42% <71.42%> (ø)
stdlib/open.go	90.47% <90.47%> (ø)
evaluator/evaluator.go	72.60% <100.00%> (ø)
stdlib/len.go	100.00% <100.00%> (ø)
stdlib/puts.go	100.00% <100.00%> (ø)
stdlib/std.go	100.00% <100.00%> (ø)

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