Simplify AoT compilation by ignoring genDir

[robwormald]

Given the AoT plugin no longer writes generated code to disk, allowing a developer to set the genDir for code generation adds a huge amount of complexity to lazy module resolution.

We should simply assume that the generated code ends up in the (virtual) filesystem as a sibling to the original file, and thus resolving for ngfactory code should require simply appending .ngfactory to the path.

[hansl]

I'm going to remove the genDir option to the plugin entirely. There's absolutely no need for it.

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