Use ReflectorReader to get inputs (fixes #3007)

[ValentinFunk]

It's imported like this in @angular/compiler as well.

Was going to mark it injectable as in https://github.com/angular/angular/blob/42a287fabf6b035d51e00cf3006c27fec00f054a/modules/%40angular/compiler/src/ng_module_resolver.ts but unfortunately not all platforms (namely browser-dynamic) provide it.

[ValentinFunk]

Sorry, does NOT fix #3007, but does fix #3006

[christopherthielen]

Hey thanks for this PR.

I'm reworking the NgModule support + config/bootstrapping. We'll be dropping the @UIRouterModule decorator in favor of router v3-like UIRouterModule.forRoot({ states }) and UIRouterModule.forChild({ states }) factory functions (even though I really hate that convention). My original @UIRouterModule decorator pattern is not compatible with AoT compile.

After those changes land, I'll take a closer look at this PR