[new compiler] Add support for type and enum resolution for custom parsers

[new compiler] Add support for type and enum resolution for custom parsers

This is in preparation for listmodel support, share the code for resolving
types and enums between the old and the new compiler, as all it needs is the
imports.

Change-Id: I4908d71eee50c769108e0e2b68b03496722fa49d
Reviewed-by: Lars Knoll <lars.knoll@digia.com>