Add find not required tscparams function to runner.ts

This function it not enable default (e.g. Travis-CI)
If we want to find unnecessary .tscparams, when exec runner with --try-without-tscparams options.
(e.g. node _infrastructure/tests/runner.js --try-without-tscparams)

secondary commit. ( https://github.com/vvakame/DefinitelyTyped/commit/1b28c3344b88e6066869ee1e41ddd6c26aae5dbc )
I tried actually use that option. and remove unnecessary .tscparams.
they are supproted --noImplicitAny already :)