function to instantiate a node with a specified constructor

[bill]

Add a function to the parser that takes a constructor and a DOMNode, and turns the DOMNode into a widget by reading the widget parameters from the node, excluding data-dojo-type and data-dojo-mixins.

[bill]

In [28094]:

Store parser's lowercase --> mixed case map as property of each widget's constructor, rather than in a global _nameMap[] hash.

This is necessary for #14960, since the constructor may have no string ID, and also fixes a subtle bug with the data-dojo-mixins feature #14716: for a node with data-dojo-type="A" and data-dojo-mixins="B, C, D", the parser was still doing a lookup as _nameMap[A], thus not finding the mixed-case methods from B, C, D.

Refs #14716, #14960 !strict.

[bill]

In [28102]:

Refactor parser to expose construct() method for instantiating a single node with a specified class. Fixes #14960 !strict.