RANGE_* constants for creeps, structures and powercreeps

clone and fixed merge conflicts of screeps/engine PR #6 by PostCrafter
added RANGE_* constants for PowerCreeps

src/game/creeps.js

@@ -18,6 +18,9 @@ function _getActiveBodyparts(body, type) {
 }
 
 function _hasActiveBodypart(body, type) {
+    if(!body) {
+        return true;
+    }
     for(var i = body.length-1; i>=0; i--) {
         if (body[i].hits <= 0)
             break;
@@ -574,7 +577,7 @@ exports.make = function(_runtimeData, _intents, _register, _globals) {
         if(this.room.controller && !this.room.controller.my && this.room.controller.safeMode) {
             return C.ERR_NOT_OWNER;
         }
-        
+
         if(resourceType == C.RESOURCE_ENERGY) {
 
             if (register.structures[target.id] &&
@@ -713,6 +716,12 @@ exports.make = function(_runtimeData, _intents, _register, _globals) {
             register.assertTargetObject(target);
             return C.ERR_INVALID_TARGET;
         }
+
+        var effect = _.find(target.effects, {power: C.PWR_FORTIFY});
+        if(effect && effect.ticksRemaining > 0) {
+            return C.ERR_INVALID_TARGET;
+        }
+
         if(!target.pos.inRangeTo(this.pos, C.RANGE_ATTACK)) {
             return C.ERR_NOT_IN_RANGE;
         }