Allow editing request settings during active jobs

[Estebangmz666]

Issue Reference

#37
Annoying Lockout #37
Fixes #37

Proposed Changes

• allowed the Amount to Stock and Batch Size fields to remain editable while a request is crafting or exporting
  • kept the resource slot locked while a job is active
  • preserved the active job unchanged
  • applied updated values only to subsequent batches
  • prevented an amount of zero from clearing the resource while its slot is locked
• renamed locksRequest() to locksResourceSlot() to better describe its behavior
• updated the guidebook and changelog to document the new behavior

Additional Context

• ran gradlew build successfully
• tested in-game using a multi-level lectern autocrafting chain
• verified that the active job retained its original batch size
• verified that updated values were applied to subsequent batches
• verified that changing the stock target prevented unnecessary future batches
• verified that entering zero during an active job did not clear the resource

The screenshots below show the amount being changed to zero during an active job and then returning to its previous value without removing the configured resource.

[rlnt]

This won't work with the pending amount calculations. It could actually lead to a lot of desync if changed multiple times. I was still a beginner when initially creating this mod. Requests are not immutable, which was a pretty bad decision looking back at it. I am planning to do a rewrite soon for modern versions and use better concepts. With immutable requests, we could schedule a new request to replace the old one as soon as the current job is finished.

I do not plan to push any more feature updates to the 1.21.1 version of this mod. Thanks for your contribution, but this won't be merged.