feat(defaultimport): default import mixed parsing

[buehler]

Feature to parse the default import syntax of the newer typescript:

const parsed = await parser.parseSource(`import Foo, { Foobar } from 'myLib';`);
const parsed = await parser.parseSource(`import Foo from 'myLib';`);
const parsed = await parser.parseSource(`import { Foo } from 'myLib';`);
const parsed = await parser.parseSource(`import { Foo, default as Bar } from 'myLib';`);

Does remove the default import definition from the generator.

BREAKING CHANGE: Remove the default import definition from the declarations.
The default imports are now generated by namedImport instead of it's
own definition. The namedImport has now a defaultAlias property that
generates the default import if needed.

[coveralls]

Coverage increased (+0.2%) to 85.436% when pulling 0c8894f on feat/default-import-mixed-parsing into fac4287 on develop.

[coveralls]

Coverage increased (+0.2%) to 85.436% when pulling 0c8894f on feat/default-import-mixed-parsing into fac4287 on develop.

[coveralls]

Coverage increased (+0.2%) to 85.436% when pulling 0c8894f on feat/default-import-mixed-parsing into fac4287 on develop.