Retry remove-builtin-method-function branch #719

[hachi8833]

Rebasing #719 is extremely hard so I recreated #719. I hope this would be OK for substitution.

Fortunately, I found some classes such as null.go or regexp.go have not been updated so I updated them as well.

[codecov]

Codecov Report

Merging #747 into master will decrease coverage by 0.34%.
The diff coverage is 89.77%.

@@            Coverage Diff             @@
##           master     #747      +/-   ##
==========================================
- Coverage   80.56%   80.22%   -0.35%     
==========================================
  Files          54       54              
  Lines        7452     7323     -129     
==========================================
- Hits         6004     5875     -129     
- Misses       1215     1220       +5     
+ Partials      233      228       -5

Impacted Files	Coverage Δ
vm/boolean.go	91.3% <100%> (-1.01%)	⬇️
vm/json.go	85.29% <100%> (-1.01%)	⬇️
vm/concurrent_rw_lock.go	90.9% <100%> (-0.76%)	⬇️
vm/channel.go	88.23% <100%> (-1.24%)	⬇️
vm/go_object.go	15.87% <15.38%> (-6.19%)	⬇️
vm/integer.go	65.52% <57.37%> (-0.64%)	⬇️
vm/match_data.go	66.66% <75%> (-3.04%)	⬇️
vm/uri.go	80.64% <75.6%> (-0.9%)	⬇️
vm/concurrent_array.go	81.81% <78.94%> (-1.52%)	⬇️
vm/float.go	82.01% <80.23%> (-0.75%)	⬇️
... and 13 more

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[st0012]

Since it'll be hard and inefficient to go through each change, I'll trust the test result and squash and merge this.
@hachi8833 thanks for the hard work!