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/LuaScriptingContext.h

@@ -0,0 +1,90 @@
+/*
+ * LuaScriptingContext.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 "LuaWrapper.h"
+#include "LuaReference.h"
+
+#include "../../lib/ScriptHandler.h"
+#include "../../lib/CScriptingModule.h"
+
+namespace scripting
+{
+
+class LuaContext : public ContextBase
+{
+public:
+	static const std::string STATE_FIELD;
+
+	LuaContext(const Script * source, const Environment * env_);
+	virtual ~LuaContext();
+
+	void run(const JsonNode & initialState) override;
+	void run(ServerCallback * server, const JsonNode & initialState) override;
+
+	//log error and return nil from LuaCFunction
+	int errorRetVoid(const std::string & message);
+
+	JsonNode callGlobal(const std::string & name, const JsonNode & parameters) override;
+	JsonNode callGlobal(ServerCallback * cb, const std::string & name, const JsonNode & parameters) override;
+
+	void getGlobal(const std::string & name, int & value) override;
+	void getGlobal(const std::string & name, std::string & value) override;
+	void getGlobal(const std::string & name, double & value) override;
+	void getGlobal(const std::string & name, JsonNode & value) override;
+
+	void setGlobal(const std::string & name, int value) override;
+	void setGlobal(const std::string & name, const std::string & value) override;
+	void setGlobal(const std::string & name, double value) override;
+	void setGlobal(const std::string & name, const JsonNode & value) override;
+
+	JsonNode saveState() override;
+
+	void pop(JsonNode & value);
+
+	void popAll();
+
+	void push(const std::string & value);
+	void push(lua_CFunction f, void * opaque);
+
+	std::string toStringRaw(int index);
+
+private:
+	lua_State * L;
+
+	const Script * script;
+
+	const Environment * env;
+
+	std::shared_ptr<LuaReference> modules;
+	std::shared_ptr<LuaReference> scriptClosure;
+
+	void cleanupGlobals();
+
+	void registerCore();
+
+	//require global function
+	static int require(lua_State * L);
+
+	//print global function
+	static int print(lua_State * L);
+
+	static int logError(lua_State * L);
+
+	//require function implementation
+	int loadModule();
+
+	int printImpl();
+
+	int logErrorImpl();
+};
+
+}