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.

lib/ScriptHandler.h

@@ -0,0 +1,133 @@
+/*
+ * ScriptHandler.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/scripting/Service.h>
+#include "IHandlerBase.h"
+#include "JsonNode.h"
+
+class JsonNode;
+class JsonSerializeFormat;
+class Services;
+
+namespace scripting
+{
+class Module;
+class ScriptImpl;
+class ScriptHandler;
+
+using ModulePtr = std::shared_ptr<Module>;
+using ScriptPtr = std::shared_ptr<ScriptImpl>;
+using ScriptMap = std::map<std::string, ScriptPtr>;
+
+class DLL_LINKAGE ScriptImpl : public Script
+{
+public:
+	enum class Implements
+	{
+		ANYTHING,
+		BATTLE_EFFECT
+		//todo: adventure effect, map object(unified with building), server query, client query(with gui), may be smth else
+	};
+
+	Implements implements;
+
+	std::string identifier;
+	std::string sourcePath;
+	std::string sourceText;
+
+	std::string code;
+
+	ModulePtr host;
+
+	ScriptImpl(const ScriptHandler * owner_);
+	virtual ~ScriptImpl();
+
+	void compile(vstd::CLoggerBase * logger);
+
+	void serializeJson(vstd::CLoggerBase * logger, JsonSerializeFormat & handler);
+	void serializeJsonState(JsonSerializeFormat & handler);
+
+	std::shared_ptr<Context> createContext(const Environment * env) const override;
+	const std::string & getName() const override;
+	const std::string & getSource() const override;
+
+	void performRegistration(::Services * services) const;
+private:
+	const ScriptHandler * owner;
+
+	void resolveHost();
+};
+
+class DLL_LINKAGE PoolImpl : public Pool
+{
+public:
+	PoolImpl(const Environment * ENV);
+	PoolImpl(const Environment * ENV, ServerCallback * SRV);
+	std::shared_ptr<Context> getContext(const Script * script) override;
+
+	void serializeState(const bool saving, JsonNode & data) override;
+private:
+	std::map<const Script *, std::shared_ptr<Context>> cache;
+
+	JsonNode state;
+
+	const Environment * env;
+	ServerCallback * srv;
+};
+
+class DLL_LINKAGE ScriptHandler : public ::IHandlerBase, public Service
+{
+public:
+	ScriptMap objects;
+
+	ScriptHandler();
+	virtual ~ScriptHandler();
+
+	const Script * resolveScript(const std::string & name) const;
+
+	std::vector<bool> getDefaultAllowed() const override;
+	std::vector<JsonNode> loadLegacyData(size_t dataSize) override;
+
+	ScriptPtr loadFromJson(vstd::CLoggerBase * logger, const std::string & scope, const JsonNode & json, const std::string & identifier) const;
+
+	void loadObject(std::string scope, std::string name, const JsonNode & data) override;
+	void loadObject(std::string scope, std::string name, const JsonNode & data, size_t index) override;
+
+	void performRegistration(Services * services) const override;
+
+	void run(std::shared_ptr<Pool> pool) const override;
+
+	template <typename Handler> void serialize(Handler & h, const int version)
+	{
+		JsonNode state;
+		if(h.saving)
+			saveState(state);
+
+		h & state;
+
+		if(!h.saving)
+			loadState(state);
+	}
+
+	ModulePtr erm;
+	ModulePtr lua;
+
+protected:
+
+private:
+	friend class ScriptImpl;
+
+	void loadState(const JsonNode & state);
+	void saveState(JsonNode & state);
+};
+
+}