Add lock/hide all buttons to region list

[flonix8]

Description

Adds two buttons to lock/unlock and hide/unhide all regions. The batch button states are independent of the regions, i.e. if the user manually unhides or unlocks regions, the buttons stay in their state and unlock / unhide the rest of the regions when clicked again.

Motivation and Context

Before, it was tedious to use the locking and hiding features, because the user had to click many times. Now it is more easy to use and therefore more useful.

How has this been tested?

Manually.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.