feat: deprecate @angular/http in favor of @angular/common/http

[alxhub]

As of 5.0, @angular/http is deprecated. @angular/common/http will
be the official HTTP API in Angular going forward.

[dancancro]

Any tips on making the changes? I have errors concerning

BaseRequestOptions
Headers
Jsonp
JsonpModule
MockBackend,
MockConnection
RequestOptions
RequestOptionsArgs
Response
ResponseOptions
URLSearchParams
XHRBackend

I found this one
from https://medium.com/spektrakel-blog/angular-httpclient-enforces-immutability-dad161d8714b

// old
let params = new URLSearchParams();
params.set(`user`, user);
params.set(`password`, password);

// new
const params = new HttpParams()
  .set(`user`, user)
  .set(`password`, password);

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