Update tslint:latest configuration for 3.15 release

[adidahiya]

let's add

• adjacent-overload-signatures
• object-literal-shorthand
• only-arrow-functions with allow-declarations option enabled
• ordered-imports with "import-sources-order": "case-insensitive" option
• arrow-parens

[jkillian]

I'm not sure I think that arrow-parens provides enough intrinsic value to add. Some won't like the extra keystrokes tradeoff for a little bit of visual contrast.

The other four I'm 👍 with

[adidahiya]

found some more:

• no-for-in-array
• object-literal-key-quotes with "as-needed" option

[jkillian]

Not the first, no-for-in-array requires typechecking. (Need to update the docs to show which rules need typechecking). The other seems good to me