allow actions without add permission in object-tools

Adding items to object-tools-items would be really helpful, but the 
original solution only displayed items in that block when the user 
had add permission. For some operations (e.g.: export as csv) the
add permission is not needed.

This change allows for adding items to this block freely from child templates.

Might be similar/related to #101
Merge pull request #459 from zsoldosp/patch-1

allow actions without add permission in object-tools
Merge branch 'stable/2.5.x'