qmljs: new import/dep tracking

Change-Id: I9f4de2a06aad3afb80372a4b80e56db658683575
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
qmljs: fingerprints for documents, libraries and FakeMetaObjects

Change-Id: Ib9c9b86fbed19539dc42696292bdb3b93dd1b575
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
qmljs: scan imports

Change-Id: Ied59f5d56c5816d9da57f23a619d604acec76000
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>