[FEATURE REQUEST] Min/Max redstone upgrade option

[MatthiasMann]

Description:

It would be really useful to have an option to output either the minimum or maximum redstone level for all slots of a drawer - either as a separate upgrade or more options for the current upgrade.

Reason:
when playing with GregTech you often get 2 or more output from electrolysing something - so I would like to keep running the machine until all drawer slots have a certain amount of items (minimum redstone level)

One issue is with empty slots:

• when the drawer is locked: ignore slots which have no item set
• when unlocked: count them
  This allows to use a 2x2 drawer for 3 item types and have it correctly report the redstone level for all 3 items