Minor Work Items fixes

[cmin764]

~This change will allow users to be able to reserve new inputs without being obliged to release the lastly retrieved item. This can be achieved explicitly by setting auto_release=False when calling keywords like Get Input Work Item and For Each Input Work Item.~

A couple of other bugfixes along the way:

• Fixed return types.
• Correctly return the active input (the set one or the lastly retrieved).
• Improved logging for dirty items.
• Internal calls flag refactoring. (cleaner naming)
• Adequate payload clearing.

Slack thread Test Task package CR Process

[cmin764]

Tested locally and in Control Room with the following processes:

• Template: Extended Producer-Consumer
• Work Items: Orders Distribution