Transition: Calculate "none" after establishing this.toScroll

Closes gh-7143
Fixes gh-7140
Toolbar: Remove call to _setOptions from inside _makeFixed

Closes gh-6686
Fixes gh-6567
Toolbar: Remove check that makes sure there is only one back button

This is a partial revert of 86b70c6510c759ebc8f474a992c8e23b2c33a1c7
Tests to make sure that, when navigating to a page with a fixed toolbar that
has addBackBtn set to true, only one such back button is created.
Adds tests for cc54a86f41454bf481efb96cf40961db0e9af534 and this commit.

Closes gh-7084
Re gh-6554
Table: fix the bug of refresh method in table widget

Closes gh-6698
Fixes gh-7090
Table: Add columntoggle refresh test

This adds tests for f61d376398ba81f7f7fa3d6f84cb9812ebfc255a.

Closes gh-7086
Button: Sync disabled state upon refresh()

Fixes gh-7139