Mel: Improved functions, code, and comments

[RunDevelopment]

As per this comment and the above discussion, I simplified the pattern for Mel's command/function syntax. We now correctly detect all built-in commands and user-defined functions. During my testing with code from GitHub, I was not able to find any problems.

While doing that, I also noticed that:

• multiline comments weren't supported,
• multiline code expressions weren't supported, and
• the way vector/matrix punctuation was matched could be simplified.

[github-actions]

JS File Size Changes (gzipped)

A total of 1 files have changed, with a combined diff of -6.2 KB (-92.5%).

file	master	pull	size diff	% diff
components/prism-mel.min.js	6.7 KB	506 B	-6.2 KB	-92.5%

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