Support highlighting acet-* functions and constants

[Sen-real]

Objective

Support highlighting acet-* functions and constants.

Abstractions

This is to address a part of #221.

Function names and constants mentioned in acetutil.chm are added into the highlight and auto-complete data files, so that:

1. they're highlighted in VS Code Editor
2. they show up in the auto-complete popup

P.S.:
The version of dev dependency "source-map" is set to 0.7.4 (the latest one) to solve the recently occurred build error on CI:

Tests performed

Got expected result.

Screen shot

[github-actions]

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