fix #394 tplScript unnecessarily extending Template

[jakub-g]

If a template had a CSS template with script in its dependencies, then
a circular dependency error might have happened due to that.

Close #395.

[benouat]

I really don't get the change here....
I already worked with Templates that have CSSTemplates with scripts and never ever faced this issue.

Moreover, i don't get at all the new Error Message

Aria.CONSTRUCTOR_IN_TPLSCRIPT = "Error: constructors should not be used in template scripts";

What does it mean ? We should never declare or use a constructor in a tplScript ????

[divdavem]

The error message should probably be something like: "A template script should not be instanciated directly."
This change does not remove the ability to have a constructor in a tplScript.

[divdavem]

@benouat The circular dependency which is mentioned in this issue is very specific.
It appears when trying to add aria.widgets.GlobalStyle as a dependency of aria.widgets.Widget. The cycle passes through aria.tools.contextual.ContextualMenu (conditional dependency of aria.templates.Template, which should probably be also removed) which depends on aria.widgets.Template, which extends aria.widgets.Widget.

[jakub-g]

I've fixed a message and added some explanatory comments to the file. The situation is exactly how @divdavem described it earlier.

[benouat]

@jakub-g ok, it's clearer, probably the original issue #394 has been poorly named, tplScript unnecessarily extending Template seems to have been way too generic for me to understand it correctly in the first place

[jakub-g]

I've renamed the #394 and added some more info in the issue and the commit details. However I'm not sure if we can provide a better commit title in 3-4 words.

[piuccio]

Integrated in b3b3c80