Auto-insert semicolon for simple variable declarations

[waf]

If the user types e.g.

var x = 5

without the semicolon, insert the semicolon for them. It only inserts on variable declarations that are on a single line.

Contains a PrettyPrompt upgrade to 6.0.3 as we needed improved autoformatting behavior to implement this feature.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.6%. Comparing base (37f9d5d) to head (1e0c9f0).

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #499     +/-   ##
=======================================
+ Coverage   79.4%   79.6%   +0.1%     
=======================================
  Files        125     126      +1     
  Lines       9358    9383     +25     
  Branches    1395    1400      +5     
=======================================
+ Hits        7437    7470     +33     
+ Misses      1435    1427      -8     
  Partials     486     486             

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