New placeholder: Replacement placeholder

Is there an existing feature request for this?

• I have searched the existing feature requests.

Are you using the latest Structurize Version?

• I am running the latest alpha version of Structurize for my Minecraft version.
  I am also running the latest versions of other mods that are part of my problem.

Did you check on the Wiki? or ask on Discord?

• I checked the MineColonies/Structurize Wiki or I asked on discord.

Minecraft Version

1.20

Structurize Version

1.0.584-BETA

Related Mods and their Versions

1. Forge 47.0.50

Is your feature request related to a problem?

Certain blocks over time change state, which causes issues because the schematic thinks those blocks change (for example copper oxidation).
Another one is plants growing over time, which you would rather that the builder does not destroy.

Feature description

The replacement placeholder basically replaces anything with a "default block", assuming the block already there is not present in the allowed list of blocks.

There is 1 setting which would be the "default block", this would be the block that is placed.
The other setting is a list of "allowed blocks", if any of these blocks exist at the location of the placeholder they would be kept there, if something else is there it would be replaced with the "default block".

This way things like copper blocks can keep all their oxidation states and they would never be replaced by plain copper over and over. Whilst still not allowing other blocks to be there.

Anything else?

https://discord.com/channels/472875599422291968/1128752652898017280 relevant discussion

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Read the linked Discord discussion, then locate Structurize's placeholder and builder behavior; the issue names no implementation files or tests. Done means a replacement placeholder keeps blocks in its allowed list, replaces other blocks with the configured default block, and preserves changing states such as copper oxidation and growing plants.