Added instantBuild rule for editor

core/src/mindustry/game/Gamemode.java

@@ -35,6 +35,7 @@ public enum Gamemode{
     }, map -> map.teams.size > 1),
     editor(true, rules -> {
         rules.infiniteResources = true;
+        rules.instantBuild = true;
         rules.editor = true;
         rules.waves = false;
         rules.waveTimer = false;

core/src/mindustry/game/Rules.java

@@ -107,6 +107,8 @@ public class Rules{
     public boolean hideBannedBlocks = false;
     /** If true, most blocks (including environmental walls) can be deconstructed. This is only meant to be used internally in sandbox/test maps. */
     public boolean allowEnvironmentDeconstruct = false;
+    /** If true, buildings will be constructed instantly, with no limit on blocks placed per second. This is highly experimental and may cause lag! */
+    public boolean instantBuild = false;
     /** If true, bannedBlocks becomes a whitelist. */
     public boolean blockWhitelist = false;
     /** If true, bannedUnits becomes a whitelist. */