Add a "Select all" option on icon and compact views in DM

The icon and compact views in DM lack a Select all option. It would mainly be useful to uncheck selected documents quickly (one select all to select all and another select all to unselect all). Currently, user needs to change view to select all.
Since a select all option is available on DAM, it would make sense that it's available on other icon / thumbnail views in DM.