add NSIS 3.08 commands

[idleberg]

Adds commands introduced in NSIS 3.08:

• GetWinVer
• !uninstfinalize

See changelog for reference

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #4838 (02dda74) into master (42eff2f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4838   +/-   ##
=======================================
  Coverage   69.94%   69.94%           
=======================================
  Files         559      559           
  Lines       58338    58338           
  Branches    11235    11235           
=======================================
  Hits        40803    40803           
  Misses      17535    17535           

Flag	Coverage Δ
unittests	69.94% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/ace/mode/nsis_highlight_rules.js	100.00% <ø> (ø)

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[andrewnester]

Thank you for your contribution!