Update lint configurations

[themightychris]

Erase all /*jslint ...*/ configs at the top of source files, as the project-wide eslint config is used now instead.

Also sort class requires by namespace, Ext first, then packages, then app. Prefix external namespace sections with /* global XXXX */ to mark it safe to the linter within that file, e.g.:

    requires: [
        'Ext.window.MessageBox',

        /* globals SlateAdmin */
        'SlateAdmin.API'
    ],