Migrate to NodeJS 16 LTS

[blitz-1306]

Changes

• Migrated to NodeJS v16 LTS.
• Switched from bin compiler distributions to wasm (as NodeJS v16 solves issues with OOMs during compiler runtime).
• Introduced CLI option --locate-compiler-cache.
• Updated README:
  • removed section about preinstalling 50+ compilers;
  • added section about manual invalidation of compiler cache;
  • other small tweaks and improvements.

Regards.

[codecov-commenter]

Codecov Report

Merging #97 (bc60c2c) into master (7e89d2e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
+ Coverage   91.94%   91.97%   +0.02%     
==========================================
  Files         252      252              
  Lines        5165     5171       +6     
  Branches      817      819       +2     
==========================================
+ Hits         4749     4756       +7     
  Misses        258      258              
+ Partials      158      157       -1     

Impacted Files	Coverage Δ
src/bin/compile.ts	89.47% <100.00%> (+0.14%)	⬆️
src/compile/kinds/compiler.ts	76.05% <100.00%> (+1.42%)	⬆️
src/compile/kinds/md.ts	76.47% <100.00%> (+2.94%)	⬆️

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[cd1m0]

Awesome work as usual! Just 2 small nits

[cd1m0]

LGTM!