extra fields for something-props

src/net/torvald/terrarum/blockproperties/BlockProp.kt

@@ -95,4 +95,9 @@ class BlockProp {
     @Transient var rngBase0 = Math.random().toFloat() // initial cycle phase (xxxxFuncX)
     @Transient var rngBase1 = Math.random().toFloat() // flicker P0, etc
     @Transient var rngBase2 = Math.random().toFloat() // flicker P1, etc
+
+    /**
+     * Mainly intended to be used by third-party modules
+     */
+    val extra = Codex()
 }

src/net/torvald/terrarum/blockproperties/WireProp.kt

@@ -1,5 +1,6 @@
 package net.torvald.terrarum.blockproperties
 
+import net.torvald.terrarum.Codex
 import net.torvald.terrarum.gameitem.ItemID
 
 /**
@@ -19,4 +20,8 @@ class WireProp {
 
     var canBranch: Boolean = true
 
+    /**
+     * Mainly intended to be used by third-party modules
+     */
+    val extra = Codex()
 }