Reviewed-by: Erik Verbruggen

Reviewed-by: Erik Verbruggen

* Bind::usesQmlPrototype is now significantly more performant
* type environments are no longer hashed by filename, but rather
  by Document *
* duplicate scope builds are avoided

Task-number: QTCREATORBUG-2835
Reviewed-by: Erik Verbruggen

Reviewed-by: Erik Verbruggen

In order to determine all components that instantiate a given component,
Bind::usesQmlPrototype was called on each document in the snapshot.
That, in turn, had to iterate over all object definitions inside the
document, resolving their prototype references.

All in all, it lead to a very large amount of fairly expensive lookups
that were slowing down Creator considerably.

Reviewed-by: Erik Verbruggen

Task-number: QTCREATORBUG-2737
Reviewed-by: Kai Koehne

This lead to the semantic checker reporting incorrect errors in these
initializers.

Task-number: QTCREATORBUG-2340
Reviewed-by: Roberto Raggi

Link now caches imports. That means importing the same library (say, Qt)
from more than one file no longer creates an importing namespace for
each one. Instead, a single one is created for the instance of Link.

To make this work, the type environment in ScopeChain has been given its
own type: Interpreter::TypeEnvironment. That has the added benefit of
being able to carry meta-information about imports. You can use
TypeEnvironment::importInfo(qmlComponentName) to get information about
the import node that caused the import of the component.

In preparation for caching Contexts.

Reviewed-by: Erik Verbruggen

Task-number: QTCREATORBUG-1736

Task-number: QTCREATORBUG-1757

The function was not used and made no sense.

Task-number: QTCREATORBUG-1388
Reviewed-by: Roberto Raggi

This used to contain all functions declared in Script blocks. With them
gone, there's no reason to keep it.

Also, a class name is added in qmjs::bind so that we have a class name
for custom properties defined inside a component.

They had not yet been updated to the new way of importing javascript.

Reviewed-by: Erik Verbruggen

Allows completion of local variable and function names.

Task-number: QTCREATORBUG-942
Reviewed-by: Roberto Raggi

Previously we just scanned every directory containing a qml file for
other qml files.

This makes import ".." work.

Reviewed-by: Erik Verbruggen

* Fill the snapshot with files that could be imported.
* Implement package imports.

* The qmldir file is not parsed yet.

Reviewed-by: Erik Verbruggen

* The "Script" type is now implicitly available without imports.
* No errors for bindings inside a Connections element.

Reviewed-by: Roberto Raggi

* For JS files: Add each Qml component that sources the file in a Script
  tag to the scope chain.
* For Qml components: Add each component that instantiates the component
  to the scope chain.
* Generate the full list of documents required for completion in a
  given file. Previously, files that included the file were missing.

There is no reason to store the Bind object in a QSharedPointer because the `binder' has the same
lifetime of its document.

Done-with: ckamm

* Support for lookup JS vs Qml
* Bind global variables.

Done-with: ckamm

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>