Update for Csound 6.18.0

[nwhetsell]

Description of changes: This pull request updates Csound’s built-in opcodes for Csound 6.18.

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[codecov]

Codecov Report

Base: 86.06% // Head: 86.06% // No change to project coverage 👍

Coverage data is based on head (ce7bcb8) compared to base (bf2913a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4974   +/-   ##
=======================================
  Coverage   86.06%   86.06%           
=======================================
  Files         544      544           
  Lines       41470    41470           
  Branches     6541     6541           
=======================================
  Hits        35691    35691           
  Misses       5779     5779           

Flag	Coverage Δ
unittests	86.06% <ø> (ø)

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

Impacted Files	Coverage Δ
src/mode/csound_orchestra_highlight_rules.js	97.56% <ø> (ø)

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[andrewnester]

Thank you, merged!