Add an auto_complete_selector

[Raoul Wols]

The trigger chars of this server are:

['$', '>', ':', '\\', '/', '*', '.', '<']

I have noticed that if I type self::, then ST will already show the AC at self:. Since self:: is scoped greedily as punctuation.accessor, you can add an auto_complete_selector in LSP-intelephense.sublime-settings:

"auto_complete_selector": "punctuation.accessor"

This likely misses out on other trigger position though. I am not familiar enough with the PHP language to understand for example in what scope you want to trigger the > character or the * character. Maybe you can improve this.