Split view factory code out of mobile ViewController

[Chris Mitchell]

Consider refactoring the parse and _instantiate functions in ViewController? out into a new dojox/mobile/app/viewfactory module, so that different mimetypes/fileext/datatypes can be mapped to custom classes that create views from data (similar to javax.activation pattern.

[ykami]

In [27503]:

Refs #12924 !strict Externalized the hard-coded parse() method, and added componentized data handlers, which are fully customizable.

[ykami]

DataHandler

DataHandler provides an interface between content data and content handlers. DataHandler calls DataSource to retrieve data, and calls ContentHandler to parse the data and create a new view. DataHandler is called from ViewController.

FileTypeMap

FileTypeMap provides a map that can be used to determine content type by the URL of the content data.

DataSource

DataSource encapsulates access to the view content data. It is called from DataHandler.

ContentTypeMap

ContentTypeMap provides a map that can be used to determine content handler class by a content type.

ContentHandler

ContentHandler parses the given data, and creates a new view with the data.

[ykami]

In [27594]: Refs #14461 !strict. Fixes for View and ViewController to use the data handlers. The hard-coded data handlers were removed.

(the ticket number I used was wrong.)

[ykami]

In [27731]:

Refs #12924 !strict Fixed initialization error.