Add API to allow a user-specified number of autocompletions to be show in the popup list

[ainslec]

The current default is 8, but for my own use case, I have increased that number 20 (which is closer to Eclipse's limit). I achieved this via hard-modification of ext-language_tools.js .

In ext-language_tools.js, I changed:

popup.renderer.$maxLines = 8;

to

popup.renderer.$maxLines = 20;

Obviously, there needs to be configurable way of user-configuring this number (with a sensible minimum check in place) so that such hard-coding is not necessary.

[github-actions]

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