Entities redesign and a few ERM features

* Made most Handlers derived from CHandlerBase and moved service API there.
* Declared existing Entity APIs.
* Added basic script context caching
* Started Lua script module
* Started Lua spell effect API
* Started script state persistence
* Started battle info callback binding
* CommitPackage removed
* Extracted spells::Caster to own header; Expanded Spell API.
* implemented !!MC:S, !!FU:E, !!FU:P, !!MA, !!VR:H, !!VR:C
* !!BU:C, !!BU:E, !!BU:G, !!BU:M implemented
* Allow use of "MC:S@varName@" to declare normal variable (technically v-variable with string key)
* Re-enabled VERM macros.
* !?GM0 added
* !?TM implemented
* Added !!MF:N
* Started !?OB, !!BM, !!HE, !!OW, !!UN
* Added basic support of w-variables
* Added support for ERM indirect variables
* Made !?FU regular trigger
* !!re (ERA loop receiver) implemented
* Fixed ERM receivers with zero args.

scripting/lua/api/events/SubscriptionRegistryProxy.h

@@ -0,0 +1,131 @@
+/*
+ * SubscriptionRegistryProxy.h, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+
+#pragma once
+
+#include <vcmi/events/Event.h>
+#include <vcmi/events/EventBus.h>
+#include <vcmi/events/SubscriptionRegistry.h>
+
+#include "../../LuaWrapper.h"
+#include "../../LuaStack.h"
+#include "../../LuaReference.h"
+
+namespace scripting
+{
+namespace api
+{
+namespace events
+{
+
+
+class EventSubscriptionProxy : public UniqueOpaqueWrapper<::events::EventSubscription, EventSubscriptionProxy>
+{
+public:
+	using Wrapper = UniqueOpaqueWrapper<::events::EventSubscription, EventSubscriptionProxy>;
+	static const std::vector<typename Wrapper::RegType> REGISTER;
+	static const std::vector<typename Wrapper::CustomRegType> REGISTER_CUSTOM;
+};
+
+template <typename EventProxy>
+class SubscriptionRegistryProxy
+{
+public:
+	using EventType = typename EventProxy::ObjectType;
+	using RegistryType = ::events::SubscriptionRegistry<EventType>;
+
+	static_assert(std::is_base_of<::events::Event, EventType>::value, "Invalid template parameter");
+
+	static int subscribeBefore(lua_State * L)
+	{
+		LuaStack S(L);
+		// subscription = subscribeBefore(eventBus, callback)
+
+		//TODO: use capture by move from c++14
+		auto callbackRef = std::make_shared<LuaReference>(L);
+
+		::events::EventBus * eventBus = nullptr;
+
+		if(!S.tryGet(1, eventBus))
+		{
+			S.push("No event bus");
+			return 1;
+		}
+
+		S.clear();
+
+		RegistryType * registry = EventType::getRegistry();
+
+		typename EventType::PreHandler callback = [=](EventType & event)
+		{
+			LuaStack S(L);
+			callbackRef->push();
+			S.push(&event);
+
+			if(lua_pcall(L, 1, 0, 0) != 0)
+			{
+				std::string msg;
+				S.tryGet(1, msg);
+				logMod->error("Script callback error: %s", msg);
+			}
+
+			S.clear();
+		};
+
+		std::unique_ptr<::events::EventSubscription> subscription = registry->subscribeBefore(eventBus, std::move(callback));
+		S.push(std::move(subscription));
+		return 1;
+	}
+
+	static int subscribeAfter(lua_State * L)
+	{
+		LuaStack S(L);
+
+		//TODO: use capture by move from c++14
+		auto callbackRef = std::make_shared<LuaReference>(L);
+
+		::events::EventBus * eventBus = nullptr;
+
+		if(!S.tryGet(1, eventBus))
+		{
+			S.push("No event bus");
+			return 1;
+		}
+
+		S.clear();
+
+		RegistryType * registry = EventType::getRegistry();
+
+		typename EventType::PostHandler callback = [=](const EventType & event)
+		{
+			LuaStack S(L);
+			callbackRef->push();
+			S.push(const_cast<EventType *>(&event)); //FIXME:
+
+			if(lua_pcall(L, 1, 0, 0) != 0)
+			{
+				std::string msg;
+				S.tryGet(1, msg);
+				logMod->error("Script callback error: %s", msg);
+			}
+
+			S.clear();
+		};
+
+		std::unique_ptr<::events::EventSubscription> subscription = registry->subscribeAfter(eventBus, std::move(callback));
+		S.push(std::move(subscription));
+		return 1;
+	}
+};
+
+
+}
+}
+}