Describe the bug

It's not intuitive to select multiple values only using CTR or SHIFT keys. We should allow to select values one by one on lists in configuration. We should also add checkmarks to further distinguish selected items from deselected and to hint that user can select them one by one.

To Reproduce

Steps to reproduce the behavior:

1. Go to monkey island -> configuration -> exploits
2. Click on "WMI exploiter". All other exploiters got deselected. Why?

Expected behavior

When you click on exploiter or any other list item only that item should get selected/deselected, we should add checkmarks/crosses to indicate that.

Screenshots

Should be something like:

Use fa icons rather than checkboxes