Add support for Typescript 3.2

[alan-agius4]

• Update to TypeScript 3.2

• fix(@ngtools/webpack): import as results in the alias being undefined with Typescript 3.2

When using the specifier.propertyName with typeChecker.getSymbolAtLocation it will return a more detailed symbol then we originally have in the usedSymbols set.

We should probably use symbol.id to actually check if the symbols are the same, however the id is not exposed in the Symbol interface.

Using node.name will return the same symbol that we have stored in the set.

Fixes #13212

[ngbot]

	Artifact	Baseline	Current	Change
❕	cli/new-production/test-project/main.js	174.25KB	175.29KB	+1.04KB

[alan-agius4]

The 1Kb size change is due to the Angular 7.2 upgrade.

[clydin]

Can you ensure that the two special cases in the isUsed call still work? (Exporting the alias and using the alias as an object literal shorthand). They both use the text of the node but the name node has the original name and not the alias name.

[clydin]

Actually we could probably clean that up some and grab the aliased symbol if present when looping through the file.

[alan-agius4]

@clydin I have added some more tests, can you check if that's the tests you had in mind?

[clydin]

Actually, let's get this in and then followup with improved testing and a potential cleanup of the special cases.

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