Allow animation disable to support vertical toolbars

[offtherailz]

Description

Bootstrap manages vertical toolbars using a css rule with ">".
Current misc/Toolbar component introduces ReactCSSAnimationGroup inside the toolbar, that produces an internal span element. This difference make the css rules for vertical toolbar not valid.

This pull requests make the animation group optional for this reason.

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix

What is the current behavior? (You can also link to an open issue here)

• Vertical toolbars do not work (no vertical toolbar is present)

What is the new behavior?

• Now devs have a way to create vertical toolbar as usual (reading the doc)

Does this PR introduce a breaking change? (check one with "x", remove the other)

• No

[coveralls]

Coverage increased (+0.001%) to 80.498% when pulling 9b7f227 on offtherailz:v_toolbars into ebb2dd1 on geosolutions-it:master.

[offtherailz]

During latest developments a vertical toolbar has been created.
For testing now you can simply check if the vertical toolbar of the dashboard (on the left) is correctly aligned in vertical
Steps to reproduce

• Open Geodashboard
• Check if the buttons on the left are correctly aligned vertically.

Note: during development the button number may change.