Add spawn protection setting (#386)

README.md

@@ -823,6 +823,12 @@ Determines if monsters will be spawned.
 Determines if villagers will be spawned.
 
     docker run -d -e SPAWN_NPCS=true
+    
+### Set spawn protection
+
+Sets the area that non-ops can not edit (0 to disable)
+
+    docker run -d -e SPAWN_PROTECTION=0
 
 ### View Distance
 Sets the amount of world data the server sends the client, measured in chunks in each direction of the player (radius, not diameter).

start-finalSetup04ServerProperties

@@ -49,6 +49,7 @@ function customizeServerProps {
   setServerProp "spawn-animals" "$SPAWN_ANIMALS"
   setServerProp "spawn-monsters" "$SPAWN_MONSTERS"
   setServerProp "spawn-npcs" "$SPAWN_NPCS"
+  setServerProp "spawn-protection" "$SPAWN_PROTECTION"
   setServerProp "generate-structures" "$GENERATE_STRUCTURES"
   setServerProp "view-distance" "$VIEW_DISTANCE"
   setServerProp "hardcore" "$HARDCORE"