rework #512 and allow write to coolingday+coolingactive

Author: john30

src/vaillant/15.uih.tsp

@@ -195,11 +195,11 @@ namespace Uih {
   namespace Sw_ge220 {
     /** CoolingDay */
     @ext(0x7c, 0)
-    model CoolingDay is ReadonlyRegister<UCH>;
+    model CoolingDay is Register<UCH>;
 
     /** CoolingActive */
     @ext(0x83, 0)
-    model CoolingActive is ReadonlyRegister<onoff>;
+    model CoolingActive is Register<onoff>;
   }
   @condition(Id.Id.sw, ">=250")
   namespace Sw_ge250 {

src/vaillant/_templates.tsp

@@ -488,6 +488,7 @@ enum Values_hcmode {
 
 enum Values_hcmode2 {
   off: 0,
+  cooling: 1,
   heat: 3,
   water: 4,
 }