"Locked" request groups

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TL;DR

Add ability to lock request groups from being edited until manually unlocked.

What?

1. Add a simple "Lock" checkbox/toggle for each named request group, located in either rename window (which should be renamed as "edit window"), or in the list of applied groups.
2. The lock state is shared accross all instances of the same group -- including chests, player characters, vehicles, space platforms, and combinators.
3. When the group is locked, you can't edit its signals (neither types of signals nor values). You can, however, edit its name.
4. You can change the modifier of a locked group.
5. Grid for the locked group appears gray-ish.

Why?

Same reasons for why lockable cells appears in the Excel or Google Docs -- prevention of accidental edits.
The design intention is to mark certain groups which should never change (like groups for recipe items) or which should almost never change (like specific constants).

See Also

• 122109: Use logistic group multiplier when auto-configuring a requester chest