chore: update angular to rc7

[Brocco]

No description provided.

[kylecordes]

I notice that CLI itself uses a ^ dependency, while the generated blueprint uses a fixed dependency. I like that letter fixed dependency, mostly because of so many past incidents. I am curious whether the floating dependency at the top level CLI package file could make it possible for bugs to slip past undetected, for example if a build were to be run in a situation where CLI and its test suite etc. are using version N+1 but the generated program will use version N.

[filipesilva]

I actually think the compiler isn't used per se right now, but will be soon for AoT.

[hansl]

It's used for lazy loading.

[filipesilva]

router needs rc.3 but otherwise lgtm.

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