New icons, emulating style of current commands. Implemented cache as …

…true false instead of positive/negative numbers.

LuaRules/Configs/customcmds.lua

@@ -10,6 +10,14 @@
 --   30000 - 39999:  LuaRules
 --
 
+--[[ WARNING!! Only BASE VANILLA ZK commands belong here!
+     If you are a modder adding custom commands, MAKE YOUR OWN FILE.
+     By overriding this file you're SETTING YOURSELF UP FOR FAILURE
+     when ZK adds something to this file (your override won't have
+     the new addition) and making things confusing for other modders
+     who might want to use your code (with your own file it will be
+     obvious where the extra commands are coming from). ]]
+
 -- if you add a command, please order it by ID!
 return {
 	RETREAT_ZONE = 10001,
@@ -107,4 +115,7 @@ return {
 
 	-- build plate
 	PLATE = 39802,
+
+	--[[ WARNING!! Only BASE VANILLA ZK commands belong here!
+	     See the bigass chunk of text at the top of the file. ]]
 }

LuaRules/Gadgets/cmd_generic_plate.lua

@@ -43,20 +43,20 @@ function setContains(set, key)
 end
 
 local function CanBuildFactoryPlate(unitDefID)
-	if not (setContains(defIDCache, unitDefID) or setContains(defIDCache, -unitDefID)) then
+	if not (setContains(defIDCache, {unitDefID, true}) or setContains(defIDCache, {unitDefID, false})) then
 		local ud = UnitDefs[unitDefID]
 		local bo = ud.buildOptions
 			for i = 1, #bo do
 				local cp = UnitDefs[bo[i]].customParams
 				if cp.parent_of_plate then
-					addToSet(defIDCache, unitDefID, true)
+					addToSet(defIDCache, {unitDefID, true})
 					return true
 				end
 			end
-		addToSet(defIDCache, -unitDefID)
+		addToSet(defIDCache, {unitDefID, false})
 		return false
 	else
-		if setContains(defIDCache, unitDefID) then
+		if setContains(defIDCache, {unitDefID, true}) then
 			return true
 		else
 			return false