Cyclic Expand / Hippie completion for vscode

I ripped this from this unmaintained package: https://github.com/msafi/xvsc/tree/master/simpleAutocomplete

The only difference so far is that this version is case sensitive.

I like the completion engine mostly, except two things:

• the order of the suggestions could be better (return the word with most matching chars first)
• can only advance, should cycle backwards too