ExtJS - Update to latest version

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Feature request from ihor-sviziev, posted on GitHub Dec 07, 2013

For now we using ExtJS version 1.1 Beta 1 (https://github.com/magento/magento2/blob/master/pub/lib/extjs/ext-core.js). Why we use really old lib? For now latest ExtJS version - 4.2.1!

[apiuser]

Comment from verklov, posted on GitHub Jan 22, 2014

@igor-svizev , thank you for reporting this issue! We are considering this issue, but not yet have a decision about it. Please observe the repository for updates.

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Comment from tkacheva, posted on GitHub Jan 29, 2015

@ihor-sviziev We are working on consistent usage of JS libraries in Magento 2. Follow the updates. Thank you.

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Comment from mcspronko, posted on GitHub Jan 29, 2015

MAGETWO-25946