Default value for Ext Direct Remoting API variable name changes in Ext JS 6.0.1

[ralscha]

Ext JS 6.0.1 change log:

The default value for Ext Direct Remoting API variable name was changed from Ext.app.REMOTING_API to Ext.REMOTING_API

for better alignment with published Ext Direct specification. If your application makes use of the loadProvider method in Ext.direct.Manager, you will need to review and possibly update the varName config option.

Maybe we should change this in our library in a future version.