address tslint issues

[TylerLeonhardt]

After talking to @TravisEz13, we need to address all tslint issues for compliance.

[TravisEz13]

tslint not tslist

[rkeithhill]

Um, there are a lot of tslint issues if you go with the tslint:recommended rules.

[TravisEz13]

@rkeithhill feel free to recommend rules that we should not address. We have a requirement that we run TSLint though.

[rkeithhill]

I've started this work on branch - https://github.com/PowerShell/vscode-powershell/tree/rkeithhill/enable-tslint

[rkeithhill]

I've merged in PR #1148 to address the vast majority of these. There is just one left. I think in this case:

I'm just going to suppress the rule on that line of code.