Update JS API to 4.7

Deprecated:

• widget.optionsPromise - use getOptions function instead. getOptions can return a promise or object.

Deprecated weird widget props

This release deprecates the use of widget.iconClass. It will still work but will warn in development.

Use widget.parentOptions.expandIconClass in place of widget.iconClass. This favors the better pattern of passing parentOptions instead of weird custom properties.

CanJS 4.0

This is a major release because it requires all dependent packages to upgrade canjs versions to 4.x. No config or app changes should be necessary for this upgrade other than updating packages.

Breaking Changes:

• Use CanJS 4.0
• Use Spectre-canjs 2.x