Lua 5.4 no string coercion in bitwise operations

[arnodel]

From the Lua 5.4 docs

The coercion of strings to numbers in arithmetic and bitwise operations has been removed from the core language.

This is implemented in this PR, with some Lua tests

Note that it breaks the Lua 5.3 Test Suite, so CI is broken until I switch to the Lua 5.4 Test Suite

[codecov]

Codecov Report

Merging #52 (ca49b8e) into master (4643709) will increase coverage by 0.27%.
The diff coverage is 89.92%.

❗ Current head ca49b8e differs from pull request most recent head 4ab8de5. Consider uploading reports for the commit 4ab8de5 to get more accurate results

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
+ Coverage   86.07%   86.35%   +0.27%     
==========================================
  Files          90       90              
  Lines        9819     9920     +101     
==========================================
+ Hits         8452     8566     +114     
+ Misses       1076     1063      -13     
  Partials      291      291              

Impacted Files	Coverage Δ
runtime/cont.go	22.58% <ø> (ø)
runtime/thread.go	85.14% <80.76%> (+6.52%)	⬆️
runtime/luacont.go	90.05% <90.32%> (+0.82%)	⬆️
lib/coroutine/coroutine.go	85.24% <100.00%> (+2.22%)	⬆️
parsing/parser.go	92.29% <100.00%> (+0.77%)	⬆️
runtime/error.go	86.41% <100.00%> (+3.08%)	⬆️
runtime/gocont.go	92.20% <100.00%> (+0.10%)	⬆️
runtime/termination.go	78.46% <100.00%> (+3.85%)	⬆️
runtime/value.go	86.91% <0.00%> (+0.62%)	⬆️
... and 4 more

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